91563876 has 18 divisors (see below), whose sum is σ = 231453222. Its totient is φ = 30521280.

The previous prime is 91563809. The next prime is 91563877. The reversal of 91563876 is 67836519.

It is a happy number.

91563876 is a `hidden beast` number, since 9 + 1 + 5 + 638 + 7 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 51494976 + 40068900 = 7176^2 + 6330^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (91563877) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1271685 + ... + 1271756.

Almost surely, 2^91563876 is an apocalyptic number.

It is an amenable number.

91563876 is an abundant number, since it is smaller than the sum of its proper divisors (139889346).

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

91563876 is a wasteful number, since it uses less digits than its factorization.

91563876 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2543451 (or 2543446 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The square root of 91563876 is about 9568.9015043525. The cubic root of 91563876 is about 450.7212729350.

The spelling of 91563876 in words is "ninety-one million, five hundred sixty-three thousand, eight hundred seventy-six".