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90409000765 = 518081800153
BaseRepresentation
bin101010000110011001…
…0111101111100111101
322122100202111002200211
41110030302331330331
52440124201011030
6105311110352421
76350263553416
oct1241462757475
9278322432624
1090409000765
1135384584456
121563195b711
1386aa795675
14453936680d
15254221c12a
hex150ccbdf3d

90409000765 has 4 divisors (see below), whose sum is σ = 108490800924. Its totient is φ = 72327200608.

The previous prime is 90409000763. The next prime is 90409000777. The reversal of 90409000765 is 56700090409.

90409000765 = 2126132 + 2126142.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 45204287769 + 45204712996 = 212613^2 + 212614^2 .

It is a cyclic number.

It is not a de Polignac number, because 90409000765 - 21 = 90409000763 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90409000763) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9040900072 + ... + 9040900081.

It is an arithmetic number, because the mean of its divisors is an integer number (27122700231).

Almost surely, 290409000765 is an apocalyptic number.

90409000765 is the 212614-th centered square number.

It is an amenable number.

90409000765 is a deficient number, since it is larger than the sum of its proper divisors (18081800159).

90409000765 is a wasteful number, since it uses less digits than its factorization.

90409000765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18081800158.

The product of its (nonzero) digits is 68040, while the sum is 40.

The spelling of 90409000765 in words is "ninety billion, four hundred nine million, seven hundred sixty-five", and thus it is an aban number.

Divisors: 1 5 18081800153 90409000765