642099672 has 96 divisors (see below), whose sum is σ = 1809990000. Its totient is φ = 205390080.

The previous prime is 642099649. The next prime is 642099697. The reversal of 642099672 is 276990246.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 377079 + ... + 378777.

Almost surely, 2^642099672 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 642099672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (904995000).

642099672 is an abundant number, since it is smaller than the sum of its proper divisors (1167890328).

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

642099672 is a wasteful number, since it uses less digits than its factorization.

642099672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1921 (or 1914 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 45.

The square root of 642099672 is about 25339.6857123367. The cubic root of 642099672 is about 862.7152652356.

The spelling of 642099672 in words is "six hundred forty-two million, ninety-nine thousand, six hundred seventy-two".