91557748 has 6 divisors (see below), whose sum is σ = 160226066. Its totient is φ = 45778872.

The previous prime is 91557743. The next prime is 91557773. The reversal of 91557748 is 84775519.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 79530724 + 12027024 = 8918^2 + 3468^2 .

It is a junction number, because it is equal to n+sod(n) for n = 91557698 and 91557707.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91557743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11444715 + ... + 11444722.

Almost surely, 2^91557748 is an apocalyptic number.

It is an amenable number.

91557748 is a deficient number, since it is larger than the sum of its proper divisors (68668318).

91557748 is a wasteful number, since it uses less digits than its factorization.

91557748 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22889441 (or 22889439 counting only the distinct ones).

The product of its digits is 352800, while the sum is 46.

The square root of 91557748 is about 9568.5812950510. The cubic root of 91557748 is about 450.7112177265.

The spelling of 91557748 in words is "ninety-one million, five hundred fifty-seven thousand, seven hundred forty-eight".