91297672 has 32 divisors (see below), whose sum is σ = 180247680. Its totient is φ = 43267840.

The previous prime is 91297651. The next prime is 91297673. The reversal of 91297672 is 27679219.

It is not an unprimeable number, because it can be changed into a prime (91297673) 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, 18597 + ... + 22987.

It is an arithmetic number, because the mean of its divisors is an integer number (5632740).

Almost surely, 2^91297672 is an apocalyptic number.

91297672 is a gapful number since it is divisible by the number (92) formed by its first and last digit.

It is an amenable number.

91297672 is a deficient number, since it is larger than the sum of its proper divisors (88950008).

91297672 is a wasteful number, since it uses less digits than its factorization.

91297672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4533 (or 4529 counting only the distinct ones).

The product of its digits is 95256, while the sum is 43.

The square root of 91297672 is about 9554.9815279780. The cubic root of 91297672 is about 450.2840544029.

The spelling of 91297672 in words is "ninety-one million, two hundred ninety-seven thousand, six hundred seventy-two".