87561870 has 32 divisors (see below), whose sum is σ = 229253760. Its totient is φ = 21227040.

The previous prime is 87561863. The next prime is 87561919. The reversal of 87561870 is 7816578.

It is a congruent number.

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, 132340 + ... + 132999.

It is an arithmetic number, because the mean of its divisors is an integer number (7164180).

Almost surely, 2^87561870 is an apocalyptic number.

87561870 is an abundant number, since it is smaller than the sum of its proper divisors (141691890).

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

87561870 is a wasteful number, since it uses less digits than its factorization.

87561870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265360.

The product of its (nonzero) digits is 94080, while the sum is 42.

The square root of 87561870 is about 9357.4499731497. The cubic root of 87561870 is about 444.0566135910.

The spelling of 87561870 in words is "eighty-seven million, five hundred sixty-one thousand, eight hundred seventy".