3157638820 has 48 divisors (see below), whose sum is σ = 8024123520. Its totient is φ = 1018934784.

The previous prime is 3157638817. The next prime is 3157638859. The reversal of 3157638820 is 288367513.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 660990 + ... + 665749.

It is an arithmetic number, because the mean of its divisors is an integer number (167169240).

Almost surely, 2^3157638820 is an apocalyptic number.

It is an amenable number.

3157638820 is an abundant number, since it is smaller than the sum of its proper divisors (4866484700).

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

3157638820 is a wasteful number, since it uses less digits than its factorization.

3157638820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1326772 (or 1326770 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 43.

The square root of 3157638820 is about 56192.8716119758. The cubic root of 3157638820 is about 1467.0811967634.

The spelling of 3157638820 in words is "three billion, one hundred fifty-seven million, six hundred thirty-eight thousand, eight hundred twenty".