647557252 has 12 divisors (see below), whose sum is σ = 1142149120. Its totient is φ = 321228936.

The previous prime is 647557247. The next prime is 647557289. The reversal of 647557252 is 252755746.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 647557199 and 647557208.

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, 636852 + ... + 637867.

Almost surely, 2^647557252 is an apocalyptic number.

It is an amenable number.

647557252 is a deficient number, since it is larger than the sum of its proper divisors (494591868).

647557252 is a wasteful number, since it uses less digits than its factorization.

647557252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1274850 (or 1274848 counting only the distinct ones).

The product of its digits is 588000, while the sum is 43.

The square root of 647557252 is about 25447.1462447167. The cubic root of 647557252 is about 865.1526129872.

The spelling of 647557252 in words is "six hundred forty-seven million, five hundred fifty-seven thousand, two hundred fifty-two".