642276768 has 48 divisors (see below), whose sum is σ = 1926832320. Its totient is φ = 183507456.

The previous prime is 642276757. The next prime is 642276797. The reversal of 642276768 is 867672246.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (48).

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

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 477213 + ... + 478556.

It is an arithmetic number, because the mean of its divisors is an integer number (40142340).

Almost surely, 2^642276768 is an apocalyptic number.

It is an amenable number.

642276768 is an abundant number, since it is smaller than the sum of its proper divisors (1284555552).

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

642276768 is a wasteful number, since it uses less digits than its factorization.

642276768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 955789 (or 955781 counting only the distinct ones).

The product of its digits is 1354752, while the sum is 48.

The square root of 642276768 is about 25343.1799109741. The cubic root of 642276768 is about 862.7945724341.

The spelling of 642276768 in words is "six hundred forty-two million, two hundred seventy-six thousand, seven hundred sixty-eight".