642795028 has 12 divisors (see below), whose sum is σ = 1127831040. Its totient is φ = 320557592.

The previous prime is 642795011. The next prime is 642795067. The reversal of 642795028 is 820597246.

It is a congruent number.

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, 208258 + ... + 211321.

It is an arithmetic number, because the mean of its divisors is an integer number (93985920).

Almost surely, 2^642795028 is an apocalyptic number.

It is an amenable number.

642795028 is a deficient number, since it is larger than the sum of its proper divisors (485036012).

642795028 is a wasteful number, since it uses less digits than its factorization.

642795028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 419966 (or 419964 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 43.

The square root of 642795028 is about 25353.4026907632. The cubic root of 642795028 is about 863.0265761023.

The spelling of 642795028 in words is "six hundred forty-two million, seven hundred ninety-five thousand, twenty-eight".