91700640 has 96 divisors (see below), whose sum is σ = 320967360. Its totient is φ = 24452352.

The previous prime is 91700621. The next prime is 91700657. The reversal of 91700640 is 4600719.

91700640 is a `hidden beast` number, since 9 + 17 + 0 + 0 + 640 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-3 number, since 3×91700640³ (a number of 25 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

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, 6294 + ... + 14933.

It is an arithmetic number, because the mean of its divisors is an integer number (3343410).

Almost surely, 2^91700640 is an apocalyptic number.

91700640 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

91700640 is an abundant number, since it is smaller than the sum of its proper divisors (229266720).

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

91700640 is a wasteful number, since it uses less digits than its factorization.

91700640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21251 (or 21237 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 91700640 is about 9576.0451126757. The cubic root of 91700640 is about 450.9455672806.

The spelling of 91700640 in words is "ninety-one million, seven hundred thousand, six hundred forty".