91028490 has 32 divisors (see below), whose sum is σ = 249678720. Its totient is φ = 20806464.

The previous prime is 91028479. The next prime is 91028501. The reversal of 91028490 is 9482019.

It is an interprime number because it is at equal distance from previous prime (91028479) and next prime (91028501).

It is a Curzon number.

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, 216525 + ... + 216944.

It is an arithmetic number, because the mean of its divisors is an integer number (7802460).

Almost surely, 2^91028490 is an apocalyptic number.

91028490 is an abundant number, since it is smaller than the sum of its proper divisors (158650230).

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

91028490 is a wasteful number, since it uses less digits than its factorization.

91028490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433486.

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 91028490 is about 9540.8851790596. The cubic root of 91028490 is about 449.8410796854.

The spelling of 91028490 in words is "ninety-one million, twenty-eight thousand, four hundred ninety".