91656390 has 32 divisors (see below), whose sum is σ = 251400960. Its totient is φ = 20949984.

The previous prime is 91656379. The next prime is 91656421. The reversal of 91656390 is 9365619.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 218020 + ... + 218439.

It is an arithmetic number, because the mean of its divisors is an integer number (7856280).

Almost surely, 2^91656390 is an apocalyptic number.

91656390 is an abundant number, since it is smaller than the sum of its proper divisors (159744570).

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

91656390 is a wasteful number, since it uses less digits than its factorization.

91656390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 436476.

The product of its (nonzero) digits is 43740, while the sum is 39.

The square root of 91656390 is about 9573.7343811075. The cubic root of 91656390 is about 450.8730212516.

The spelling of 91656390 in words is "ninety-one million, six hundred fifty-six thousand, three hundred ninety".