91897472 has 32 divisors (see below), whose sum is σ = 183518400. Its totient is φ = 45838080.

The previous prime is 91897469. The next prime is 91897499. The reversal of 91897472 is 27479819.

It is a tau number, because it is divible by the number of its divisors (32).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87929 + ... + 88967.

It is an arithmetic number, because the mean of its divisors is an integer number (5734950).

Almost surely, 2^91897472 is an apocalyptic number.

It is an amenable number.

91897472 is a deficient number, since it is larger than the sum of its proper divisors (91620928).

91897472 is a wasteful number, since it uses less digits than its factorization.

91897472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1744 (or 1732 counting only the distinct ones).

The product of its digits is 254016, while the sum is 47.

The square root of 91897472 is about 9586.3169152704. The cubic root of 91897472 is about 451.2679826475.

It can be divided in two parts, 9189 and 7472, that added together give a palindrome (16661).

The spelling of 91897472 in words is "ninety-one million, eight hundred ninety-seven thousand, four hundred seventy-two".