646047639 has 12 divisors (see below), whose sum is σ = 958401496. Its totient is φ = 419057712.

The previous prime is 646047629. The next prime is 646047641. The reversal of 646047639 is 936740646.

646047639 is a `hidden beast` number, since 6 + 4 + 6 + 0 + 4 + 7 + 639 = 666.

It is not a de Polignac number, because 646047639 - 2¹² = 646043543 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 646047594 and 646047603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646047629) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 969709 + ... + 970374.

Almost surely, 2^646047639 is an apocalyptic number.

646047639 is a deficient number, since it is larger than the sum of its proper divisors (312353857).

646047639 is a wasteful number, since it uses less digits than its factorization.

646047639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1940126 (or 1940123 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 45.

The square root of 646047639 is about 25417.4672026935. The cubic root of 646047639 is about 864.4797963639.

The spelling of 646047639 in words is "six hundred forty-six million, forty-seven thousand, six hundred thirty-nine".