6721157870 has 64 divisors (see below), whose sum is σ = 14101655040. Its totient is φ = 2258748288.

The previous prime is 6721157809. The next prime is 6721157887. The reversal of 6721157870 is 787511276.

It is a super-2 number, since 2×6721157870² = 90347926226925873800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1538309 + ... + 1542671.

It is an arithmetic number, because the mean of its divisors is an integer number (220338360).

Almost surely, 2^6721157870 is an apocalyptic number.

6721157870 is an abundant number, since it is smaller than the sum of its proper divisors (7380497170).

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

6721157870 is a wasteful number, since it uses less digits than its factorization.

6721157870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4809.

The product of its (nonzero) digits is 164640, while the sum is 44.

The square root of 6721157870 is about 81982.6681073506. The cubic root of 6721157870 is about 1887.1859683692.

The spelling of 6721157870 in words is "six billion, seven hundred twenty-one million, one hundred fifty-seven thousand, eight hundred seventy".