87312890 has 16 divisors (see below), whose sum is σ = 179615232. Its totient is φ = 29935824.

The previous prime is 87312871. The next prime is 87312917. The reversal of 87312890 is 9821378.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 623594 + ... + 623733.

It is an arithmetic number, because the mean of its divisors is an integer number (11225952).

Almost surely, 2^87312890 is an apocalyptic number.

87312890 is an abundant number, since it is smaller than the sum of its proper divisors (92302342).

87312890 is a wasteful number, since it uses less digits than its factorization.

87312890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1247341.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 87312890 is about 9344.1366642403. The cubic root of 87312890 is about 443.6353260519.

The spelling of 87312890 in words is "eighty-seven million, three hundred twelve thousand, eight hundred ninety".