642956244 has 96 divisors (see below), whose sum is σ = 1806336000. Its totient is φ = 177740640.

The previous prime is 642956221. The next prime is 642956261. The reversal of 642956244 is 442659246.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 642956196 and 642956205.

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, 125077 + ... + 130115.

It is an arithmetic number, because the mean of its divisors is an integer number (18816000).

Almost surely, 2^642956244 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 642956244, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (903168000).

642956244 is an abundant number, since it is smaller than the sum of its proper divisors (1163379756).

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

642956244 is a wasteful number, since it uses less digits than its factorization.

642956244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5098 (or 5082 counting only the distinct ones).

The product of its digits is 414720, while the sum is 42.

The square root of 642956244 is about 25356.5818674363. The cubic root of 642956244 is about 863.0987204388.

The spelling of 642956244 in words is "six hundred forty-two million, nine hundred fifty-six thousand, two hundred forty-four".