87981810 has 32 divisors (see below), whose sum is σ = 241322112. Its totient is φ = 20110080.

The previous prime is 87981797. The next prime is 87981821. The reversal of 87981810 is 1818978.

It is a super-2 number, since 2×87981810² = 15481597781752200, which contains 22 as substring.

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 15 ways as a sum of consecutive naturals, for example, 209271 + ... + 209690.

It is an arithmetic number, because the mean of its divisors is an integer number (7541316).

Almost surely, 2^87981810 is an apocalyptic number.

87981810 is an abundant number, since it is smaller than the sum of its proper divisors (153340302).

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

87981810 is a wasteful number, since it uses less digits than its factorization.

87981810 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 418978.

The product of its (nonzero) digits is 32256, while the sum is 42.

The square root of 87981810 is about 9379.8619392825. The cubic root of 87981810 is about 444.7653688824.

The spelling of 87981810 in words is "eighty-seven million, nine hundred eighty-one thousand, eight hundred ten".