91397736 has 24 divisors (see below), whose sum is σ = 247535730. Its totient is φ = 30465888.

The previous prime is 91397711. The next prime is 91397759. The reversal of 91397736 is 63779319.

It can be written as a sum of positive squares in only one way, i.e., 86601636 + 4796100 = 9306^2 + 2190^2 .

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

It is a super-2 number, since 2×91397736² = 16707092291851392, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 91397691 and 91397700.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 634635 + ... + 634778.

Almost surely, 2^91397736 is an apocalyptic number.

It is an amenable number.

91397736 is an abundant number, since it is smaller than the sum of its proper divisors (156137994).

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

91397736 is a wasteful number, since it uses less digits than its factorization.

91397736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1269425 (or 1269418 counting only the distinct ones).

The product of its digits is 214326, while the sum is 45.

The square root of 91397736 is about 9560.2163155443. The cubic root of 91397736 is about 450.4485009927.

The spelling of 91397736 in words is "ninety-one million, three hundred ninety-seven thousand, seven hundred thirty-six".