91290258 has 24 divisors (see below), whose sum is σ = 198340428. Its totient is φ = 30346272.

The previous prime is 91290253. The next prime is 91290259. The reversal of 91290258 is 85209219.

It can be written as a sum of positive squares in 2 ways, for example, as 86992929 + 4297329 = 9327^2 + 2073^2 .

It is a super-2 number, since 2×91290258² = 16667822411413128, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (91290253) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 85 + ... + 13512.

Almost surely, 2^91290258 is an apocalyptic number.

91290258 is an abundant number, since it is smaller than the sum of its proper divisors (107050170).

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

91290258 is a wasteful number, since it uses less digits than its factorization.

91290258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13978 (or 13975 counting only the distinct ones).

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

The square root of 91290258 is about 9554.5935549347. The cubic root of 91290258 is about 450.2718653504.

The spelling of 91290258 in words is "ninety-one million, two hundred ninety thousand, two hundred fifty-eight".