90632791 has 4 divisors (see below), whose sum is σ = 92169000. Its totient is φ = 89096584.

The previous prime is 90632783. The next prime is 90632807. The reversal of 90632791 is 19723609.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 90632791 - 2³ = 90632783 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 90632791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90632741) 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, 768016 + ... + 768133.

It is an arithmetic number, because the mean of its divisors is an integer number (23042250).

Almost surely, 2^90632791 is an apocalyptic number.

90632791 is a deficient number, since it is larger than the sum of its proper divisors (1536209).

90632791 is a wasteful number, since it uses less digits than its factorization.

90632791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1536208.

The product of its (nonzero) digits is 20412, while the sum is 37.

The square root of 90632791 is about 9520.1255769029. The cubic root of 90632791 is about 449.1883162363.

The spelling of 90632791 in words is "ninety million, six hundred thirty-two thousand, seven hundred ninety-one".