87109990 has 16 divisors (see below), whose sum is σ = 171052560. Its totient is φ = 31676320.

The previous prime is 87109973. The next prime is 87109991. The reversal of 87109990 is 9990178.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87109991) 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, 395845 + ... + 396064.

It is an arithmetic number, because the mean of its divisors is an integer number (10690785).

Almost surely, 2^87109990 is an apocalyptic number.

87109990 is a deficient number, since it is larger than the sum of its proper divisors (83942570).

87109990 is a wasteful number, since it uses less digits than its factorization.

87109990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 791927.

The product of its (nonzero) digits is 40824, while the sum is 43.

The square root of 87109990 is about 9333.2732736163. The cubic root of 87109990 is about 443.2914156887.

The spelling of 87109990 in words is "eighty-seven million, one hundred nine thousand, nine hundred ninety".