642623772 has 96 divisors (see below), whose sum is σ = 1794465792. Its totient is φ = 175006656.

The previous prime is 642623741. The next prime is 642623797. The reversal of 642623772 is 277326246.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 642623772.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 940543 + ... + 941225.

It is an arithmetic number, because the mean of its divisors is an integer number (18692352).

Almost surely, 2^642623772 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 642623772, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (897232896).

642623772 is an abundant number, since it is smaller than the sum of its proper divisors (1151842020).

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

642623772 is a wasteful number, since it uses less digits than its factorization.

642623772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1207 (or 1205 counting only the distinct ones).

The product of its digits is 169344, while the sum is 39.

The square root of 642623772 is about 25350.0250887450. The cubic root of 642623772 is about 862.9499256406.

The spelling of 642623772 in words is "six hundred forty-two million, six hundred twenty-three thousand, seven hundred seventy-two".