3138668720 has 40 divisors (see below), whose sum is σ = 7960807440. Its totient is φ = 1141333760.

The previous prime is 3138668719. The next prime is 3138668737. The reversal of 3138668720 is 278668313.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (44).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1782455 + ... + 1784214.

It is an arithmetic number, because the mean of its divisors is an integer number (199020186).

Almost surely, 2^3138668720 is an apocalyptic number.

It is an amenable number.

3138668720 is an abundant number, since it is smaller than the sum of its proper divisors (4822138720).

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

3138668720 is a wasteful number, since it uses less digits than its factorization.

3138668720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3566693 (or 3566687 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 44.

The square root of 3138668720 is about 56023.8227899525. The cubic root of 3138668720 is about 1464.1373730171.

The spelling of 3138668720 in words is "three billion, one hundred thirty-eight million, six hundred sixty-eight thousand, seven hundred twenty".