87278520 has 64 divisors (see below), whose sum is σ = 299243520. Its totient is φ = 19949184.

The previous prime is 87278501. The next prime is 87278539. The reversal of 87278520 is 2587278.

It is an interprime number because it is at equal distance from previous prime (87278501) and next prime (87278539).

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, 51112 + ... + 52791.

It is an arithmetic number, because the mean of its divisors is an integer number (4675680).

Almost surely, 2^87278520 is an apocalyptic number.

It is an amenable number.

87278520 is an abundant number, since it is smaller than the sum of its proper divisors (211965000).

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

87278520 is a wasteful number, since it uses less digits than its factorization.

87278520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103924 (or 103920 counting only the distinct ones).

The product of its (nonzero) digits is 62720, while the sum is 39.

The square root of 87278520 is about 9342.2973619983. The cubic root of 87278520 is about 443.5771072814.

The spelling of 87278520 in words is "eighty-seven million, two hundred seventy-eight thousand, five hundred twenty".