646308472 has 16 divisors (see below), whose sum is σ = 1222554240. Its totient is φ = 320294016.

The previous prime is 646308463. The next prime is 646308511. The reversal of 646308472 is 274803646.

It is a happy number.

It is a congruent number.

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, 356568 + ... + 358375.

It is an arithmetic number, because the mean of its divisors is an integer number (76409640).

Almost surely, 2^646308472 is an apocalyptic number.

It is an amenable number.

646308472 is a deficient number, since it is larger than the sum of its proper divisors (576245768).

646308472 is a wasteful number, since it uses less digits than its factorization.

646308472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 715062 (or 715058 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 40.

The square root of 646308472 is about 25422.5976642829. The cubic root of 646308472 is about 864.5961213872.

The spelling of 646308472 in words is "six hundred forty-six million, three hundred eight thousand, four hundred seventy-two".