3155728720 has 40 divisors (see below), whose sum is σ = 7507706976. Its totient is φ = 1232934528.

The previous prime is 3155728691. The next prime is 3155728733. The reversal of 3155728720 is 278275513.

It is a happy number.

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 (40).

It is a congruent number.

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, 455242 + ... + 462121.

Almost surely, 2^3155728720 is an apocalyptic number.

It is an amenable number.

3155728720 is an abundant number, since it is smaller than the sum of its proper divisors (4351978256).

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

3155728720 is a wasteful number, since it uses less digits than its factorization.

3155728720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 917419 (or 917413 counting only the distinct ones).

The product of its (nonzero) digits is 117600, while the sum is 40.

The square root of 3155728720 is about 56175.8731129299. The cubic root of 3155728720 is about 1466.7853177656.

The spelling of 3155728720 in words is "three billion, one hundred fifty-five million, seven hundred twenty-eight thousand, seven hundred twenty".