642974075 has 6 divisors (see below), whose sum is σ = 797287884. Its totient is φ = 514379240.

The previous prime is 642974071. The next prime is 642974077. The reversal of 642974075 is 570479246.

It is not a de Polignac number, because 642974075 - 2² = 642974071 is a prime.

It is a super-2 number, since 2×642974075² = 826831322244211250, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642974071) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12859457 + ... + 12859506.

It is an arithmetic number, because the mean of its divisors is an integer number (132881314).

Almost surely, 2^642974075 is an apocalyptic number.

642974075 is a deficient number, since it is larger than the sum of its proper divisors (154313809).

642974075 is a wasteful number, since it uses less digits than its factorization.

642974075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25718973 (or 25718968 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 44.

The square root of 642974075 is about 25356.9334699604. The cubic root of 642974075 is about 863.1066990901.

The spelling of 642974075 in words is "six hundred forty-two million, nine hundred seventy-four thousand, seventy-five".