642969356 has 12 divisors (see below), whose sum is σ = 1125776568. Its totient is φ = 321318912.

The previous prime is 642969343. The next prime is 642969361. The reversal of 642969356 is 653969246.

642969356 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 32501 + ... + 48396.

It is an arithmetic number, because the mean of its divisors is an integer number (93814714).

Almost surely, 2^642969356 is an apocalyptic number.

It is an amenable number.

642969356 is a deficient number, since it is larger than the sum of its proper divisors (482807212).

642969356 is a wasteful number, since it uses less digits than its factorization.

642969356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82888 (or 82886 counting only the distinct ones).

The product of its digits is 2099520, while the sum is 50.

The square root of 642969356 is about 25356.8404183171. The cubic root of 642969356 is about 863.1045875428.

The spelling of 642969356 in words is "six hundred forty-two million, nine hundred sixty-nine thousand, three hundred fifty-six".