91656990 has 24 divisors (see below), whose sum is σ = 238308408. Its totient is φ = 24441840.

The previous prime is 91656967. The next prime is 91656991. The reversal of 91656990 is 9965619.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91656991) 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, 509116 + ... + 509295.

It is an arithmetic number, because the mean of its divisors is an integer number (9929517).

Almost surely, 2^91656990 is an apocalyptic number.

91656990 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

91656990 is an abundant number, since it is smaller than the sum of its proper divisors (146651418).

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

91656990 is a wasteful number, since it uses less digits than its factorization.

91656990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1018424 (or 1018421 counting only the distinct ones).

The product of its (nonzero) digits is 131220, while the sum is 45.

The square root of 91656990 is about 9573.7657167909. The cubic root of 91656990 is about 450.8740050827.

The spelling of 91656990 in words is "ninety-one million, six hundred fifty-six thousand, nine hundred ninety".