3128756132420 has 48 divisors (see below), whose sum is σ = 6653456161968. Its totient is φ = 1235739525120.

The previous prime is 3128756132407. The next prime is 3128756132459. The reversal of 3128756132420 is 242316578213.

It can be written as a sum of positive squares in 8 ways, for example, as 62608046656 + 3066148085764 = 250216^2 + 1751042^2 .

It is a super-2 number, since 2×3128756132420² (a number of 26 digits) contains 22 as substring.

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, 1022291 + ... + 2702330.

It is an arithmetic number, because the mean of its divisors is an integer number (138613670041).

Almost surely, 2^{3128756132420} is an apocalyptic number.

It is an amenable number.

3128756132420 is an abundant number, since it is smaller than the sum of its proper divisors (3524700029548).

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

3128756132420 is a wasteful number, since it uses less digits than its factorization.

3128756132420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3725160 (or 3725158 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 44.

The spelling of 3128756132420 in words is "three trillion, one hundred twenty-eight billion, seven hundred fifty-six million, one hundred thirty-two thousand, four hundred twenty".