81087888 has 40 divisors (see below), whose sum is σ = 239403328. Its totient is φ = 23167872.

The previous prime is 81087887. The next prime is 81087899. The reversal of 81087888 is 88878018.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (81087887) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 120331 + ... + 121002.

Almost surely, 2^81087888 is an apocalyptic number.

It is an amenable number.

81087888 is an abundant number, since it is smaller than the sum of its proper divisors (158315440).

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

81087888 is a wasteful number, since it uses less digits than its factorization.

81087888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241351 (or 241345 counting only the distinct ones).

The product of its (nonzero) digits is 229376, while the sum is 48.

The square root of 81087888 is about 9004.8813429162. The cubic root of 81087888 is about 432.8313039474.

The spelling of 81087888 in words is "eighty-one million, eighty-seven thousand, eight hundred eighty-eight".