87311290 has 16 divisors (see below), whose sum is σ = 171447840. Its totient is φ = 31749520.

The previous prime is 87311281. The next prime is 87311291. The reversal of 87311290 is 9211378.

It is a super-2 number, since 2×87311290² = 15246522722928200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (87311291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 396760 + ... + 396979.

It is an arithmetic number, because the mean of its divisors is an integer number (10715490).

Almost surely, 2^87311290 is an apocalyptic number.

87311290 is a deficient number, since it is larger than the sum of its proper divisors (84136550).

87311290 is a wasteful number, since it uses less digits than its factorization.

87311290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 793757.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 87311290 is about 9344.0510486619. The cubic root of 87311290 is about 443.6326161776.

The spelling of 87311290 in words is "eighty-seven million, three hundred eleven thousand, two hundred ninety".