90604691 has 4 divisors (see below), whose sum is σ = 91160712. Its totient is φ = 90048672.

The previous prime is 90604687. The next prime is 90604697. The reversal of 90604691 is 19640609.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19640609 = 89 ⋅220681.

It is a cyclic number.

It is not a de Polignac number, because 90604691 - 2² = 90604687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90604697) 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, 277766 + ... + 278091.

It is an arithmetic number, because the mean of its divisors is an integer number (22790178).

Almost surely, 2^90604691 is an apocalyptic number.

90604691 is a deficient number, since it is larger than the sum of its proper divisors (556021).

90604691 is a wasteful number, since it uses less digits than its factorization.

90604691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 556020.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 90604691 is about 9518.6496416246. The cubic root of 90604691 is about 449.1418889766.

The spelling of 90604691 in words is "ninety million, six hundred four thousand, six hundred ninety-one".