90891660 has 48 divisors (see below), whose sum is σ = 254977632. Its totient is φ = 24192000.

The previous prime is 90891641. The next prime is 90891701. The reversal of 90891660 is 6619809.

It is a super-2 number, since 2×90891660² = 16522587715111200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40980 + ... + 43140.

It is an arithmetic number, because the mean of its divisors is an integer number (5312034).

Almost surely, 2^90891660 is an apocalyptic number.

It is an amenable number.

90891660 is an abundant number, since it is smaller than the sum of its proper divisors (164085972).

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

90891660 is a wasteful number, since it uses less digits than its factorization.

90891660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2874 (or 2872 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 39.

The square root of 90891660 is about 9533.7117640508. The cubic root of 90891660 is about 449.6155729188.

The spelling of 90891660 in words is "ninety million, eight hundred ninety-one thousand, six hundred sixty".