642641624 has 32 divisors (see below), whose sum is σ = 1248534000. Its totient is φ = 309735552.

The previous prime is 642641611. The next prime is 642641627. The reversal of 642641624 is 426146246.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642641627) 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, 168167 + ... + 171945.

Almost surely, 2^642641624 is an apocalyptic number.

It is an amenable number.

642641624 is a deficient number, since it is larger than the sum of its proper divisors (605892376).

642641624 is a wasteful number, since it uses less digits than its factorization.

642641624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4547 (or 4543 counting only the distinct ones).

The product of its digits is 55296, while the sum is 35.

The square root of 642641624 is about 25350.3771964048. The cubic root of 642641624 is about 862.9579164434.

The spelling of 642641624 in words is "six hundred forty-two million, six hundred forty-one thousand, six hundred twenty-four".