646764452 has 12 divisors (see below), whose sum is σ = 1132015836. Its totient is φ = 323331360.

The previous prime is 646764421. The next prime is 646764497. The reversal of 646764452 is 254467646.

646764452 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 481539136 + 165225316 = 21944^2 + 12854^2 .

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, 43718 + ... + 56610.

It is an arithmetic number, because the mean of its divisors is an integer number (94334653).

Almost surely, 2^646764452 is an apocalyptic number.

It is an amenable number.

646764452 is a deficient number, since it is larger than the sum of its proper divisors (485251384).

646764452 is a wasteful number, since it uses less digits than its factorization.

646764452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25438 (or 25436 counting only the distinct ones).

The product of its digits is 967680, while the sum is 44.

The square root of 646764452 is about 25431.5640887461. The cubic root of 646764452 is about 864.7994019564.

The spelling of 646764452 in words is "six hundred forty-six million, seven hundred sixty-four thousand, four hundred fifty-two".