647123572 has 6 divisors (see below), whose sum is σ = 1132466258. Its totient is φ = 323561784.

The previous prime is 647123557. The next prime is 647123593. The reversal of 647123572 is 275321746.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 579653776 + 67469796 = 24076^2 + 8214^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80890443 + ... + 80890450.

Almost surely, 2^647123572 is an apocalyptic number.

It is an amenable number.

647123572 is a deficient number, since it is larger than the sum of its proper divisors (485342686).

647123572 is a wasteful number, since it uses less digits than its factorization.

647123572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161780897 (or 161780895 counting only the distinct ones).

The product of its digits is 70560, while the sum is 37.

The square root of 647123572 is about 25438.6236262892. The cubic root of 647123572 is about 864.9594340961.

The spelling of 647123572 in words is "six hundred forty-seven million, one hundred twenty-three thousand, five hundred seventy-two".