646678852 has 12 divisors (see below), whose sum is σ = 1134933100. Its totient is φ = 322412256.

The previous prime is 646678807. The next prime is 646678871. The reversal of 646678852 is 258876646.

It can be written as a sum of positive squares in 2 ways, for example, as 529736256 + 116942596 = 23016^2 + 10814^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 646678852.

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, 230223 + ... + 233014.

Almost surely, 2^646678852 is an apocalyptic number.

It is an amenable number.

646678852 is a deficient number, since it is larger than the sum of its proper divisors (488254248).

646678852 is a wasteful number, since it uses less digits than its factorization.

646678852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 463590 (or 463588 counting only the distinct ones).

The product of its digits is 3870720, while the sum is 52.

The square root of 646678852 is about 25429.8810850543. The cubic root of 646678852 is about 864.7612478831.

The spelling of 646678852 in words is "six hundred forty-six million, six hundred seventy-eight thousand, eight hundred fifty-two".