7871956428 has 72 divisors (see below), whose sum is σ = 21380814000. Its totient is φ = 2247649152.

The previous prime is 7871956409. The next prime is 7871956439. The reversal of 7871956428 is 8246591787.

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, 1142578 + ... + 1149446.

It is an arithmetic number, because the mean of its divisors is an integer number (296955750).

Almost surely, 2^7871956428 is an apocalyptic number.

It is an amenable number.

7871956428 is an abundant number, since it is smaller than the sum of its proper divisors (13508857572).

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

7871956428 is a wasteful number, since it uses less digits than its factorization.

7871956428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8839 (or 8830 counting only the distinct ones).

The product of its digits is 6773760, while the sum is 57.

The square root of 7871956428 is about 88724.0465037523. The cubic root of 7871956428 is about 1989.2722630461.

The spelling of 7871956428 in words is "seven billion, eight hundred seventy-one million, nine hundred fifty-six thousand, four hundred twenty-eight".