642037626 has 24 divisors (see below), whose sum is σ = 1464297120. Its totient is φ = 202748616.

The previous prime is 642037609. The next prime is 642037651. The reversal of 642037626 is 626730246.

It is a happy number.

642037626 is a `hidden beast` number, since 6 + 4 + 20 + 3 + 7 + 626 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 938310 + ... + 938993.

It is an arithmetic number, because the mean of its divisors is an integer number (61012380).

Almost surely, 2^642037626 is an apocalyptic number.

642037626 is an abundant number, since it is smaller than the sum of its proper divisors (822259494).

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

642037626 is a wasteful number, since it uses less digits than its factorization.

642037626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1877330 (or 1877327 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 36.

The square root of 642037626 is about 25338.4613976461. The cubic root of 642037626 is about 862.6874763227.

The spelling of 642037626 in words is "six hundred forty-two million, thirty-seven thousand, six hundred twenty-six".