646945692 has 12 divisors (see below), whose sum is σ = 1509539976. Its totient is φ = 215648560.

The previous prime is 646945669. The next prime is 646945697. The reversal of 646945692 is 296549646.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646945697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26956059 + ... + 26956082.

It is an arithmetic number, because the mean of its divisors is an integer number (125794998).

Almost surely, 2^646945692 is an apocalyptic number.

It is an amenable number.

646945692 is an abundant number, since it is smaller than the sum of its proper divisors (862594284).

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

646945692 is a wasteful number, since it uses less digits than its factorization.

646945692 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53912148 (or 53912146 counting only the distinct ones).

The product of its digits is 2799360, while the sum is 51.

The square root of 646945692 is about 25435.1271276556. The cubic root of 646945692 is about 864.8801740751.

The spelling of 646945692 in words is "six hundred forty-six million, nine hundred forty-five thousand, six hundred ninety-two".