646046390 has 32 divisors (see below), whose sum is σ = 1273708800. Its totient is φ = 233980000.

The previous prime is 646046383. The next prime is 646046411. The reversal of 646046390 is 93640646.

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 15 ways as a sum of consecutive naturals, for example, 15911 + ... + 39309.

It is an arithmetic number, because the mean of its divisors is an integer number (39803400).

Almost surely, 2^646046390 is an apocalyptic number.

646046390 is a deficient number, since it is larger than the sum of its proper divisors (627662410).

646046390 is a wasteful number, since it uses less digits than its factorization.

646046390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23668.

The product of its (nonzero) digits is 93312, while the sum is 38.

The square root of 646046390 is about 25417.4426329637. The cubic root of 646046390 is about 864.4792392657.

The spelling of 646046390 in words is "six hundred forty-six million, forty-six thousand, three hundred ninety".