91740720 has 40 divisors (see below), whose sum is σ = 284396976. Its totient is φ = 24464128.

The previous prime is 91740709. The next prime is 91740731. The reversal of 91740720 is 2704719.

It is an interprime number because it is at equal distance from previous prime (91740709) and next prime (91740731).

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×91740720² = 16832719412236800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 190887 + ... + 191366.

Almost surely, 2^91740720 is an apocalyptic number.

It is an amenable number.

91740720 is an abundant number, since it is smaller than the sum of its proper divisors (192656256).

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

91740720 is a wasteful number, since it uses less digits than its factorization.

91740720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 382269 (or 382263 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 30.

The square root of 91740720 is about 9578.1376060276. The cubic root of 91740720 is about 451.0112566286.

The spelling of 91740720 in words is "ninety-one million, seven hundred forty thousand, seven hundred twenty".