90788431 has 4 divisors (see below), whose sum is σ = 90813952. Its totient is φ = 90762912.

The previous prime is 90788419. The next prime is 90788513. The reversal of 90788431 is 13488709.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13488709 = 13 ⋅1037593.

It is a cyclic number.

It is not a de Polignac number, because 90788431 - 2⁷ = 90788303 is a prime.

It is a super-2 number, since 2×90788431² = 16485078406883522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90788231) 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, 6351 + ... + 14896.

It is an arithmetic number, because the mean of its divisors is an integer number (22703488).

Almost surely, 2^90788431 is an apocalyptic number.

90788431 is a deficient number, since it is larger than the sum of its proper divisors (25521).

90788431 is a wasteful number, since it uses less digits than its factorization.

90788431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25520.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 90788431 is about 9528.2963325035. The cubic root of 90788431 is about 449.4452934594.

It can be divided in two parts, 90788 and 431, that added together give a palindrome (91219).

The spelling of 90788431 in words is "ninety million, seven hundred eighty-eight thousand, four hundred thirty-one".