91819072 has 28 divisors (see below), whose sum is σ = 182990236. Its totient is φ = 45711360.

The previous prime is 91819051. The next prime is 91819087. The reversal of 91819072 is 27091819.

It can be written as a sum of positive squares in 2 ways, for example, as 26790976 + 65028096 = 5176^2 + 8064^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12448 + ... + 18400.

Almost surely, 2^91819072 is an apocalyptic number.

It is an amenable number.

91819072 is a deficient number, since it is larger than the sum of its proper divisors (91171164).

91819072 is a wasteful number, since it uses less digits than its factorization.

91819072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6206 (or 6196 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 37.

The square root of 91819072 is about 9582.2268810543. The cubic root of 91819072 is about 451.1396168544.

The spelling of 91819072 in words is "ninety-one million, eight hundred nineteen thousand, seventy-two".