87878790 has 32 divisors (see below), whose sum is σ = 234344160. Its totient is φ = 23434272.

The previous prime is 87878783. The next prime is 87878807. The reversal of 87878790 is 9787878.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 162469 + ... + 163008.

It is an arithmetic number, because the mean of its divisors is an integer number (7323255).

Almost surely, 2^87878790 is an apocalyptic number.

87878790 is an abundant number, since it is smaller than the sum of its proper divisors (146465370).

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

87878790 is a wasteful number, since it uses less digits than its factorization.

87878790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325493 (or 325487 counting only the distinct ones).

The product of its (nonzero) digits is 1580544, while the sum is 54.

The square root of 87878790 is about 9374.3687787499. The cubic root of 87878790 is about 444.5917056227.

The spelling of 87878790 in words is "eighty-seven million, eight hundred seventy-eight thousand, seven hundred ninety".