642791692 has 48 divisors (see below), whose sum is σ = 1224115200. Its totient is φ = 294158592.

The previous prime is 642791689. The next prime is 642791701. The reversal of 642791692 is 296197246.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1072809 + ... + 1073407.

It is an arithmetic number, because the mean of its divisors is an integer number (25502400).

Almost surely, 2^642791692 is an apocalyptic number.

It is an amenable number.

642791692 is a deficient number, since it is larger than the sum of its proper divisors (581323508).

642791692 is a wasteful number, since it uses less digits than its factorization.

642791692 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1030 (or 1028 counting only the distinct ones).

The product of its digits is 326592, while the sum is 46.

The square root of 642791692 is about 25353.3369006922. The cubic root of 642791692 is about 863.0250831113.

The spelling of 642791692 in words is "six hundred forty-two million, seven hundred ninety-one thousand, six hundred ninety-two".