820172857324 has 12 divisors (see below), whose sum is σ = 1435319109000. Its totient is φ = 410081683328.

The previous prime is 820172857319. The next prime is 820172857331. The reversal of 820172857324 is 423758271028.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 782149 + ... + 1500700.

It is an arithmetic number, because the mean of its divisors is an integer number (119609925750).

Almost surely, 2^820172857324 is an apocalyptic number.

It is an amenable number.

820172857324 is a deficient number, since it is larger than the sum of its proper divisors (615146251676).

820172857324 is a wasteful number, since it uses less digits than its factorization.

820172857324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2372672 (or 2372670 counting only the distinct ones).

The product of its (nonzero) digits is 1505280, while the sum is 49.

The spelling of 820172857324 in words is "eight hundred twenty billion, one hundred seventy-two million, eight hundred fifty-seven thousand, three hundred twenty-four".