90691788 has 48 divisors (see below), whose sum is σ = 243008640. Its totient is φ = 26035200.

The previous prime is 90691781. The next prime is 90691789. The reversal of 90691788 is 88719609.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (90691781) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15573 + ... + 20588.

It is an arithmetic number, because the mean of its divisors is an integer number (5062680).

Almost surely, 2^90691788 is an apocalyptic number.

It is an amenable number.

90691788 is an abundant number, since it is smaller than the sum of its proper divisors (152316852).

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

90691788 is a wasteful number, since it uses less digits than its factorization.

90691788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36198 (or 36196 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 48.

The square root of 90691788 is about 9523.2236138820. The cubic root of 90691788 is about 449.2857607877.

The spelling of 90691788 in words is "ninety million, six hundred ninety-one thousand, seven hundred eighty-eight".