91407748 has 6 divisors (see below), whose sum is σ = 159963566. Its totient is φ = 45703872.

The previous prime is 91407733. The next prime is 91407749. The reversal of 91407748 is 84770419.

It can be written as a sum of positive squares in only one way, i.e., 51868804 + 39538944 = 7202^2 + 6288^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 91407748.

It is not an unprimeable number, because it can be changed into a prime (91407749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11425965 + ... + 11425972.

Almost surely, 2^91407748 is an apocalyptic number.

It is an amenable number.

91407748 is a deficient number, since it is larger than the sum of its proper divisors (68555818).

91407748 is a wasteful number, since it uses less digits than its factorization.

91407748 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22851941 (or 22851939 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 40.

The square root of 91407748 is about 9560.7399295243. The cubic root of 91407748 is about 450.4649482481.

The spelling of 91407748 in words is "ninety-one million, four hundred seven thousand, seven hundred forty-eight".