642087628 has 24 divisors (see below), whose sum is σ = 1382958752. Its totient is φ = 254012544.

The previous prime is 642087581. The next prime is 642087631. The reversal of 642087628 is 826780246.

642087628 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 7 ways as a sum of consecutive naturals, for example, 881625 + ... + 882352.

Almost surely, 2^642087628 is an apocalyptic number.

It is an amenable number.

642087628 is an abundant number, since it is smaller than the sum of its proper divisors (740871124).

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

642087628 is a wasteful number, since it uses less digits than its factorization.

642087628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1764001 (or 1763999 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 43.

The square root of 642087628 is about 25339.4480602873. The cubic root of 642087628 is about 862.7098711574.

The spelling of 642087628 in words is "six hundred forty-two million, eighty-seven thousand, six hundred twenty-eight".