87139580 has 48 divisors (see below), whose sum is σ = 200309760. Its totient is φ = 31579200.

The previous prime is 87139573. The next prime is 87139651. The reversal of 87139580 is 8593178.

It is a happy number.

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, 94361 + ... + 95279.

It is an arithmetic number, because the mean of its divisors is an integer number (4173120).

Almost surely, 2^87139580 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 87139580, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100154880).

87139580 is an abundant number, since it is smaller than the sum of its proper divisors (113170180).

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

87139580 is a wasteful number, since it uses less digits than its factorization.

87139580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1370 (or 1368 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 41.

The square root of 87139580 is about 9334.8583277948. The cubic root of 87139580 is about 443.3416032276.

The spelling of 87139580 in words is "eighty-seven million, one hundred thirty-nine thousand, five hundred eighty".