91590228 has 36 divisors (see below), whose sum is σ = 237170388. Its totient is φ = 29784960.

The previous prime is 91590211. The next prime is 91590259. The reversal of 91590228 is 82209519.

It can be written as a sum of positive squares in 2 ways, for example, as 15586704 + 76003524 = 3948^2 + 8718^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 91590192 and 91590201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29551 + ... + 32502.

Almost surely, 2^91590228 is an apocalyptic number.

It is an amenable number.

91590228 is an abundant number, since it is smaller than the sum of its proper divisors (145580160).

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

91590228 is a wasteful number, since it uses less digits than its factorization.

91590228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62104 (or 62099 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 91590228 is about 9570.2783658575. The cubic root of 91590228 is about 450.7645078447.

The spelling of 91590228 in words is "ninety-one million, five hundred ninety thousand, two hundred twenty-eight".