90131650 has 24 divisors (see below), whose sum is σ = 191594880. Its totient is φ = 30902160.

The previous prime is 90131647. The next prime is 90131669. The reversal of 90131650 is 5613109.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 128410 + ... + 129109.

It is an arithmetic number, because the mean of its divisors is an integer number (7983120).

Almost surely, 2^90131650 is an apocalyptic number.

90131650 is an abundant number, since it is smaller than the sum of its proper divisors (101463230).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

90131650 is a wasteful number, since it uses less digits than its factorization.

90131650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257538 (or 257533 counting only the distinct ones).

The product of its (nonzero) digits is 810, while the sum is 25.

The square root of 90131650 is about 9493.7690091976. The cubic root of 90131650 is about 448.3588781743.

Adding to 90131650 its reverse (5613109), we get a palindrome (95744759).

The spelling of 90131650 in words is "ninety million, one hundred thirty-one thousand, six hundred fifty".