646440462 has 24 divisors (see below), whose sum is σ = 1424362680. Its totient is φ = 211827600.

The previous prime is 646440433. The next prime is 646440493. The reversal of 646440462 is 264044646.

It is a happy number.

646440462 is a `hidden beast` number, since 6 + 4 + 644 + 0 + 4 + 6 + 2 = 666.

646440462 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 303289 + ... + 305412.

It is an arithmetic number, because the mean of its divisors is an integer number (59348445).

Almost surely, 2^646440462 is an apocalyptic number.

646440462 is an abundant number, since it is smaller than the sum of its proper divisors (777922218).

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

646440462 is a wasteful number, since it uses less digits than its factorization.

646440462 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 608768 (or 608765 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 36.

The square root of 646440462 is about 25425.1934505915. The cubic root of 646440462 is about 864.6549737152.

The spelling of 646440462 in words is "six hundred forty-six million, four hundred forty thousand, four hundred sixty-two".