87261590 has 64 divisors (see below), whose sum is σ = 178053120. Its totient is φ = 30568320.

The previous prime is 87261557. The next prime is 87261599. The reversal of 87261590 is 9516278.

It is a super-2 number, since 2×87261590² = 15229170178656200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87261599) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 237587 + ... + 237953.

It is an arithmetic number, because the mean of its divisors is an integer number (2782080).

Almost surely, 2^87261590 is an apocalyptic number.

87261590 is an abundant number, since it is smaller than the sum of its proper divisors (90791530).

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

87261590 is a wasteful number, since it uses less digits than its factorization.

87261590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 477.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 87261590 is about 9341.3912240094. The cubic root of 87261590 is about 443.5484242177.

The spelling of 87261590 in words is "eighty-seven million, two hundred sixty-one thousand, five hundred ninety".