90664791 has 24 divisors (see below), whose sum is σ = 146770560. Its totient is φ = 48757632.

The previous prime is 90664787. The next prime is 90664829. The reversal of 90664791 is 19746609.

It is not a de Polignac number, because 90664791 - 2² = 90664787 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90664391) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1401 + ... + 13538.

It is an arithmetic number, because the mean of its divisors is an integer number (6115440).

Almost surely, 2^90664791 is an apocalyptic number.

90664791 is a deficient number, since it is larger than the sum of its proper divisors (56105769).

90664791 is a wasteful number, since it uses less digits than its factorization.

90664791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14983 (or 14966 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 42.

The square root of 90664791 is about 9521.8060786807. The cubic root of 90664791 is about 449.2411754520.

The spelling of 90664791 in words is "ninety million, six hundred sixty-four thousand, seven hundred ninety-one".