642447792 has 60 divisors (see below), whose sum is σ = 2054816400. Its totient is φ = 183556224.

The previous prime is 642447763. The next prime is 642447797. The reversal of 642447792 is 297744246.

642447792 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not an unprimeable number, because it can be changed into a prime (642447797) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 317667 + ... + 319682.

It is an arithmetic number, because the mean of its divisors is an integer number (34246940).

Almost surely, 2^642447792 is an apocalyptic number.

It is an amenable number.

642447792 is an abundant number, since it is smaller than the sum of its proper divisors (1412368608).

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

642447792 is a wasteful number, since it uses less digits than its factorization.

642447792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 637370 (or 637361 counting only the distinct ones).

The product of its digits is 677376, while the sum is 45.

The square root of 642447792 is about 25346.5538486004. The cubic root of 642447792 is about 862.8711466314.

The spelling of 642447792 in words is "six hundred forty-two million, four hundred forty-seven thousand, seven hundred ninety-two".