90405925885 has 8 divisors (see below), whose sum is σ = 118349575776. Its totient is φ = 65749764240.

The previous prime is 90405925873. The next prime is 90405925889. The reversal of 90405925885 is 58852950409.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 90405925885 - 2¹¹ = 90405923837 is a prime.

It is a super-2 number, since 2×90405925885² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (55), and also a Moran number because the ratio is a prime number: 1643744107 = 90405925885 / (9 + 0 + 4 + 0 + 5 + 9 + 2 + 5 + 8 + 8 + 5).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90405925889) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 821871999 + ... + 821872108.

It is an arithmetic number, because the mean of its divisors is an integer number (14793696972).

Almost surely, 2^90405925885 is an apocalyptic number.

It is an amenable number.

90405925885 is a deficient number, since it is larger than the sum of its proper divisors (27943649891).

90405925885 is a wasteful number, since it uses less digits than its factorization.

90405925885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1643744123.

The product of its (nonzero) digits is 5184000, while the sum is 55.

The spelling of 90405925885 in words is "ninety billion, four hundred five million, nine hundred twenty-five thousand, eight hundred eighty-five".