91878572 has 12 divisors (see below), whose sum is σ = 161106960. Its totient is φ = 45848016.

The previous prime is 91878569. The next prime is 91878587. The reversal of 91878572 is 27587819.

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, 20528 + ... + 24599.

It is an arithmetic number, because the mean of its divisors is an integer number (13425580).

Almost surely, 2^91878572 is an apocalyptic number.

It is an amenable number.

91878572 is a deficient number, since it is larger than the sum of its proper divisors (69228388).

91878572 is a wasteful number, since it uses less digits than its factorization.

91878572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45640 (or 45638 counting only the distinct ones).

The product of its digits is 282240, while the sum is 47.

The square root of 91878572 is about 9585.3310845270. The cubic root of 91878572 is about 451.2370440031.

The spelling of 91878572 in words is "ninety-one million, eight hundred seventy-eight thousand, five hundred seventy-two".