87771864920 has 32 divisors (see below), whose sum is σ = 206073076320. Its totient is φ = 33582278400.

The previous prime is 87771864883. The next prime is 87771864949. The reversal of 87771864920 is 2946817778.

It is a self number, because there is not a number n which added to its sum of digits gives 87771864920.

It is a congruent number.

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, 47701181 + ... + 47703020.

It is an arithmetic number, because the mean of its divisors is an integer number (6439783635).

Almost surely, 2^87771864920 is an apocalyptic number.

It is an amenable number.

87771864920 is an abundant number, since it is smaller than the sum of its proper divisors (118301211400).

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

87771864920 is a wasteful number, since it uses less digits than its factorization.

87771864920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95404235 (or 95404231 counting only the distinct ones).

The product of its (nonzero) digits is 9483264, while the sum is 59.

The spelling of 87771864920 in words is "eighty-seven billion, seven hundred seventy-one million, eight hundred sixty-four thousand, nine hundred twenty".