642996837 has 12 divisors (see below), whose sum is σ = 1061455200. Its totient is φ = 367426728.

The previous prime is 642996811. The next prime is 642996857. The reversal of 642996837 is 738699246.

It is a happy number.

642996837 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 642996837 - 2⁸ = 642996581 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642996857) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5103087 + ... + 5103212.

It is an arithmetic number, because the mean of its divisors is an integer number (88454600).

Almost surely, 2^642996837 is an apocalyptic number.

It is an amenable number.

642996837 is a deficient number, since it is larger than the sum of its proper divisors (418458363).

642996837 is a wasteful number, since it uses less digits than its factorization.

642996837 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10206312 (or 10206309 counting only the distinct ones).

The product of its digits is 3919104, while the sum is 54.

The square root of 642996837 is about 25357.3822978635. The cubic root of 642996837 is about 863.1168839501.

The spelling of 642996837 in words is "six hundred forty-two million, nine hundred ninety-six thousand, eight hundred thirty-seven".