3157978788 has 18 divisors (see below), whose sum is σ = 7982668694. Its totient is φ = 1052659584.

The previous prime is 3157978787. The next prime is 3157978801. The reversal of 3157978788 is 8878797513.

It can be written as a sum of positive squares in only one way, i.e., 3052341504 + 105637284 = 55248^2 + 10278^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (3157978783) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 43860781 + ... + 43860852.

Almost surely, 2^3157978788 is an apocalyptic number.

It is an amenable number.

3157978788 is an abundant number, since it is smaller than the sum of its proper divisors (4824689906).

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

3157978788 is a wasteful number, since it uses less digits than its factorization.

3157978788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87721643 (or 87721638 counting only the distinct ones).

The product of its digits is 23708160, while the sum is 63.

The square root of 3157978788 is about 56195.8965405838. The cubic root of 3157978788 is about 1467.1338460994.

The spelling of 3157978788 in words is "three billion, one hundred fifty-seven million, nine hundred seventy-eight thousand, seven hundred eighty-eight".