90372665 has 4 divisors (see below), whose sum is σ = 108447204. Its totient is φ = 72298128.

The previous prime is 90372661. The next prime is 90372673. The reversal of 90372665 is 56627309.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56627309 = 2141 ⋅26449.

It can be written as a sum of positive squares in 2 ways, for example, as 26708224 + 63664441 = 5168^2 + 7979^2 .

It is a cyclic number.

It is not a de Polignac number, because 90372665 - 2² = 90372661 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90372661) 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, 9037262 + ... + 9037271.

It is an arithmetic number, because the mean of its divisors is an integer number (27111801).

Almost surely, 2^90372665 is an apocalyptic number.

It is an amenable number.

90372665 is a deficient number, since it is larger than the sum of its proper divisors (18074539).

90372665 is a wasteful number, since it uses less digits than its factorization.

90372665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18074538.

The product of its (nonzero) digits is 68040, while the sum is 38.

The square root of 90372665 is about 9506.4538604045. The cubic root of 90372665 is about 448.7581646184.

The spelling of 90372665 in words is "ninety million, three hundred seventy-two thousand, six hundred sixty-five".