88561891 has 32 divisors (see below), whose sum is σ = 108864000. Its totient is φ = 71047680.

The previous prime is 88561883. The next prime is 88561903. The reversal of 88561891 is 19816588.

It is not a de Polignac number, because 88561891 - 2³ = 88561883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (88561801) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 253585 + ... + 253933.

It is an arithmetic number, because the mean of its divisors is an integer number (3402000).

Almost surely, 2^88561891 is an apocalyptic number.

88561891 is a deficient number, since it is larger than the sum of its proper divisors (20302109).

88561891 is a wasteful number, since it uses less digits than its factorization.

88561891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 459.

The product of its digits is 138240, while the sum is 46.

The square root of 88561891 is about 9410.7327557422. The cubic root of 88561891 is about 445.7407030390.

The spelling of 88561891 in words is "eighty-eight million, five hundred sixty-one thousand, eight hundred ninety-one".