856144869272 has 128 divisors (see below), whose sum is σ = 2019322137600. Its totient is φ = 333330877440.

The previous prime is 856144869247. The next prime is 856144869337. The reversal of 856144869272 is 272968441658.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 140050088 + ... + 140056200.

It is an arithmetic number, because the mean of its divisors is an integer number (15775954200).

Almost surely, 2^856144869272 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 856144869272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1009661068800).

856144869272 is an abundant number, since it is smaller than the sum of its proper divisors (1163177268328).

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

856144869272 is a wasteful number, since it uses less digits than its factorization.

856144869272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8038 (or 8012 counting only the distinct ones).

The product of its digits is 46448640, while the sum is 62.

The spelling of 856144869272 in words is "eight hundred fifty-six billion, one hundred forty-four million, eight hundred sixty-nine thousand, two hundred seventy-two".