642799872 has 216 divisors, whose sum is σ = 2178478848. Its totient is φ = 179712000.

The previous prime is 642799841. The next prime is 642799873. The reversal of 642799872 is 278997246.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642799873) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 328497 + ... + 330447.

Almost surely, 2^642799872 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 642799872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1089239424).

642799872 is an abundant number, since it is smaller than the sum of its proper divisors (1535678976).

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

642799872 is a wasteful number, since it uses less digits than its factorization.

642799872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1997 (or 1980 counting only the distinct ones).

The product of its digits is 3048192, while the sum is 54.

The square root of 642799872 is about 25353.4982201668. The cubic root of 642799872 is about 863.0287439734.

The spelling of 642799872 in words is "six hundred forty-two million, seven hundred ninety-nine thousand, eight hundred seventy-two".