91745720 has 32 divisors (see below), whose sum is σ = 225195120. Its totient is φ = 33361920.

The previous prime is 91745711. The next prime is 91745729. The reversal of 91745720 is 2754719.

It is an interprime number because it is at equal distance from previous prime (91745711) and next prime (91745729).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91745729) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 103817 + ... + 104696.

Almost surely, 2^91745720 is an apocalyptic number.

It is an amenable number.

91745720 is an abundant number, since it is smaller than the sum of its proper divisors (133449400).

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

91745720 is a wasteful number, since it uses less digits than its factorization.

91745720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208535 (or 208531 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 35.

The square root of 91745720 is about 9578.3986135470. The cubic root of 91745720 is about 451.0194500652.

The spelling of 91745720 in words is "ninety-one million, seven hundred forty-five thousand, seven hundred twenty".