87797220 has 72 divisors (see below), whose sum is σ = 285977664. Its totient is φ = 20067264.

The previous prime is 87797219. The next prime is 87797243. The reversal of 87797220 is 2279778.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11992 + ... + 17871.

It is an arithmetic number, because the mean of its divisors is an integer number (3971912).

Almost surely, 2^87797220 is an apocalyptic number.

It is an amenable number.

87797220 is an abundant number, since it is smaller than the sum of its proper divisors (198180444).

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

87797220 is a wasteful number, since it uses less digits than its factorization.

87797220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29889 (or 29880 counting only the distinct ones).

The product of its (nonzero) digits is 98784, while the sum is 42.

The square root of 87797220 is about 9370.0170757582. The cubic root of 87797220 is about 444.4541048363.

The spelling of 87797220 in words is "eighty-seven million, seven hundred ninety-seven thousand, two hundred twenty".