3128487720 has 64 divisors (see below), whose sum is σ = 9389831040. Its totient is φ = 833875200.

The previous prime is 3128487689. The next prime is 3128487737. The reversal of 3128487720 is 277848213.

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, 330250 + ... + 339590.

It is an arithmetic number, because the mean of its divisors is an integer number (146716110).

Almost surely, 2^3128487720 is an apocalyptic number.

3128487720 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

3128487720 is an abundant number, since it is smaller than the sum of its proper divisors (6261343320).

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

3128487720 is a wasteful number, since it uses less digits than its factorization.

3128487720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12146 (or 12142 counting only the distinct ones).

The product of its (nonzero) digits is 150528, while the sum is 42.

The square root of 3128487720 is about 55932.8858543880. The cubic root of 3128487720 is about 1462.5525684954.

The spelling of 3128487720 in words is "three billion, one hundred twenty-eight million, four hundred eighty-seven thousand, seven hundred twenty".