91137672 has 24 divisors (see below), whose sum is σ = 246831390. Its totient is φ = 30379200.

The previous prime is 91137637. The next prime is 91137677. The reversal of 91137672 is 27673119.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 89984196 + 1153476 = 9486^2 + 1074^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (91137677) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 632829 + ... + 632972.

Almost surely, 2^91137672 is an apocalyptic number.

It is an amenable number.

91137672 is an abundant number, since it is smaller than the sum of its proper divisors (155693718).

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

91137672 is a wasteful number, since it uses less digits than its factorization.

91137672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1265813 (or 1265806 counting only the distinct ones).

The product of its digits is 15876, while the sum is 36.

The square root of 91137672 is about 9546.6052605101. The cubic root of 91137672 is about 450.0208582924.

It can be divided in two parts, 91137 and 672, that added together give a square (91809 = 303²).

The spelling of 91137672 in words is "ninety-one million, one hundred thirty-seven thousand, six hundred seventy-two".