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90745 = 518149
BaseRepresentation
bin10110001001111001
311121110221
4112021321
510400440
61540041
7525364
oct261171
9147427
1090745
11621a6
1244621
13323c5
14250db
151bd4a
hex16279

90745 has 4 divisors (see below), whose sum is σ = 108900. Its totient is φ = 72592.

The previous prime is 90731. The next prime is 90749. The reversal of 90745 is 54709.

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 29241 + 61504 = 171^2 + 248^2 .

It is a cyclic number.

It is not a de Polignac number, because 90745 - 27 = 90617 is a prime.

It is an alternating number because its digits alternate between odd and even.

90745 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (90749) 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, 9070 + ... + 9079.

It is an arithmetic number, because the mean of its divisors is an integer number (27225).

290745 is an apocalyptic number.

It is an amenable number.

90745 is a deficient number, since it is larger than the sum of its proper divisors (18155).

90745 is a wasteful number, since it uses less digits than its factorization.

90745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18154.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 90745 is about 301.2391076869. The cubic root of 90745 is about 44.9373614092.

The spelling of 90745 in words is "ninety thousand, seven hundred forty-five".

Divisors: 1 5 18149 90745