3215978388 has 54 divisors (see below), whose sum is σ = 9456513066. Its totient is φ = 918850464.

The previous prime is 3215978369. The next prime is 3215978393. The reversal of 3215978388 is 8838795123.

It can be written as a sum of positive squares in only one way, i.e., 2349147024 + 866831364 = 48468^2 + 29442^2 .

It is a super-3 number, since 3×3215978388³ (a number of 29 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 909795 + ... + 913322.

Almost surely, 2^3215978388 is an apocalyptic number.

It is an amenable number.

3215978388 is an abundant number, since it is smaller than the sum of its proper divisors (6240534678).

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

3215978388 is a wasteful number, since it uses less digits than its factorization.

3215978388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1823141 (or 1823129 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 54.

The square root of 3215978388 is about 56709.5969655930. The cubic root of 3215978388 is about 1476.0612319542.

The spelling of 3215978388 in words is "three billion, two hundred fifteen million, nine hundred seventy-eight thousand, three hundred eighty-eight".