646338870 has 48 divisors (see below), whose sum is σ = 1753551072. Its totient is φ = 164862720.

The previous prime is 646338853. The next prime is 646338881. The reversal of 646338870 is 78833646.

646338870 is a `hidden beast` number, since 6 + 4 + 633 + 8 + 8 + 7 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 154051 + ... + 158190.

It is an arithmetic number, because the mean of its divisors is an integer number (36532314).

Almost surely, 2^646338870 is an apocalyptic number.

646338870 is an abundant number, since it is smaller than the sum of its proper divisors (1107212202).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

646338870 is a wasteful number, since it uses less digits than its factorization.

646338870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312277 (or 312274 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 45.

The square root of 646338870 is about 25423.1955111862. The cubic root of 646338870 is about 864.6096761019.

The spelling of 646338870 in words is "six hundred forty-six million, three hundred thirty-eight thousand, eight hundred seventy".