87156780 has 24 divisors (see below), whose sum is σ = 244039152. Its totient is φ = 23241792.

The previous prime is 87156767. The next prime is 87156809. The reversal of 87156780 is 8765178.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 726247 + ... + 726366.

It is an arithmetic number, because the mean of its divisors is an integer number (10168298).

Almost surely, 2^87156780 is an apocalyptic number.

It is an amenable number.

87156780 is an abundant number, since it is smaller than the sum of its proper divisors (156882372).

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

87156780 is a wasteful number, since it uses less digits than its factorization.

87156780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1452625 (or 1452623 counting only the distinct ones).

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

The square root of 87156780 is about 9335.7795603795. The cubic root of 87156780 is about 443.3707708914.

The spelling of 87156780 in words is "eighty-seven million, one hundred fifty-six thousand, seven hundred eighty".