1647128252 has 48 divisors (see below), whose sum is σ = 3654685440. Its totient is φ = 630854400.

The previous prime is 1647128173. The next prime is 1647128269. The reversal of 1647128252 is 2528217461.

It is a congruent number.

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, 27149 + ... + 63492.

It is an arithmetic number, because the mean of its divisors is an integer number (76139280).

Almost surely, 2^1647128252 is an apocalyptic number.

It is an amenable number.

1647128252 is an abundant number, since it is smaller than the sum of its proper divisors (2007557188).

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

1647128252 is a wasteful number, since it uses less digits than its factorization.

1647128252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90722 (or 90720 counting only the distinct ones).

The product of its digits is 53760, while the sum is 38.

The square root of 1647128252 is about 40584.8278547538. The cubic root of 1647128252 is about 1180.9798076649.

The spelling of 1647128252 in words is "one billion, six hundred forty-seven million, one hundred twenty-eight thousand, two hundred fifty-two".