642905724 has 24 divisors (see below), whose sum is σ = 1500569728. Its totient is φ = 214236720.

The previous prime is 642905723. The next prime is 642905759. The reversal of 642905724 is 427509246.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642905723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48939 + ... + 60669.

Almost surely, 2^642905724 is an apocalyptic number.

It is an amenable number.

642905724 is an abundant number, since it is smaller than the sum of its proper divisors (857664004).

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

642905724 is a wasteful number, since it uses less digits than its factorization.

642905724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16305 (or 16303 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 39.

The square root of 642905724 is about 25355.5856568134. The cubic root of 642905724 is about 863.0761139810.

The spelling of 642905724 in words is "six hundred forty-two million, nine hundred five thousand, seven hundred twenty-four".