642899552 has 12 divisors (see below), whose sum is σ = 1265708556. Its totient is φ = 321449760.

The previous prime is 642899507. The next prime is 642899573. The reversal of 642899552 is 255998246.

It is a self number, because there is not a number n which added to its sum of digits gives 642899552.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10045274 + ... + 10045337.

It is an arithmetic number, because the mean of its divisors is an integer number (105475713).

Almost surely, 2^642899552 is an apocalyptic number.

It is an amenable number.

642899552 is a deficient number, since it is larger than the sum of its proper divisors (622809004).

642899552 is a wasteful number, since it uses less digits than its factorization.

642899552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20090621 (or 20090613 counting only the distinct ones).

The product of its digits is 1555200, while the sum is 50.

The square root of 642899552 is about 25355.4639476386. The cubic root of 642899552 is about 863.0733520816.

The spelling of 642899552 in words is "six hundred forty-two million, eight hundred ninety-nine thousand, five hundred fifty-two".