642707794 has 12 divisors (see below), whose sum is σ = 1017473454. Its totient is φ = 304440192.

The previous prime is 642707789. The next prime is 642707801. The reversal of 642707794 is 497707246.

642707794 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 only one way, i.e., 524181025 + 118526769 = 22895^2 + 10887^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 444367 + ... + 445810.

Almost surely, 2^642707794 is an apocalyptic number.

642707794 is a deficient number, since it is larger than the sum of its proper divisors (374765660).

642707794 is a wasteful number, since it uses less digits than its factorization.

642707794 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 890217 (or 890198 counting only the distinct ones).

The product of its (nonzero) digits is 592704, while the sum is 46.

The square root of 642707794 is about 25351.6822715969. The cubic root of 642707794 is about 862.9875337622.

The spelling of 642707794 in words is "six hundred forty-two million, seven hundred seven thousand, seven hundred ninety-four".