90561864 has 16 divisors (see below), whose sum is σ = 226404720. Its totient is φ = 30187280.

The previous prime is 90561859. The next prime is 90561871. The reversal of 90561864 is 46816509.

It is a super-2 number, since 2×90561864² = 16402902422308992, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1886682 + ... + 1886729.

It is an arithmetic number, because the mean of its divisors is an integer number (14150295).

Almost surely, 2^90561864 is an apocalyptic number.

It is an amenable number.

90561864 is an abundant number, since it is smaller than the sum of its proper divisors (135842856).

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

90561864 is a wasteful number, since it uses less digits than its factorization.

90561864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3773420 (or 3773416 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 90561864 is about 9516.3997393972. The cubic root of 90561864 is about 449.0711110695.

The spelling of 90561864 in words is "ninety million, five hundred sixty-one thousand, eight hundred sixty-four".