871651620 has 72 divisors (see below), whose sum is σ = 3021729984. Its totient is φ = 199234368.

The previous prime is 871651601. The next prime is 871651633. The reversal of 871651620 is 26156178.

871651620 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 344634 + ... + 347153.

It is an arithmetic number, because the mean of its divisors is an integer number (41968472).

Almost surely, 2^871651620 is an apocalyptic number.

It is an amenable number.

871651620 is an abundant number, since it is smaller than the sum of its proper divisors (2150078364).

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

871651620 is a wasteful number, since it uses less digits than its factorization.

871651620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 691809 (or 691804 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 871651620 is about 29523.7467134509. The cubic root of 871651620 is about 955.2439898135.

The spelling of 871651620 in words is "eight hundred seventy-one million, six hundred fifty-one thousand, six hundred twenty".