642694748 has 12 divisors (see below), whose sum is σ = 1145937240. Its totient is φ = 315284112.

The previous prime is 642694747. The next prime is 642694757. The reversal of 642694748 is 847496246.

It is a junction number, because it is equal to n+sod(n) for n = 642694696 and 642694705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642694747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1515578 + ... + 1516001.

It is an arithmetic number, because the mean of its divisors is an integer number (95494770).

Almost surely, 2^642694748 is an apocalyptic number.

It is an amenable number.

642694748 is a deficient number, since it is larger than the sum of its proper divisors (503242492).

642694748 is a wasteful number, since it uses less digits than its factorization.

642694748 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3031636 (or 3031634 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 50.

The square root of 642694748 is about 25351.4249698119. The cubic root of 642694748 is about 862.9816946071.

The spelling of 642694748 in words is "six hundred forty-two million, six hundred ninety-four thousand, seven hundred forty-eight".