646392740 has 48 divisors (see below), whose sum is σ = 1552801152. Its totient is φ = 221412096.

The previous prime is 646392737. The next prime is 646392763. The reversal of 646392740 is 47293646.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 260144 + ... + 262616.

It is an arithmetic number, because the mean of its divisors is an integer number (32350024).

Almost surely, 2^646392740 is an apocalyptic number.

It is an amenable number.

646392740 is an abundant number, since it is smaller than the sum of its proper divisors (906408412).

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

646392740 is a wasteful number, since it uses less digits than its factorization.

646392740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4356 (or 4354 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 41.

The square root of 646392740 is about 25424.2549546688. The cubic root of 646392740 is about 864.6336961279.

The spelling of 646392740 in words is "six hundred forty-six million, three hundred ninety-two thousand, seven hundred forty".