642697604 has 6 divisors (see below), whose sum is σ = 1124720814. Its totient is φ = 321348800.

The previous prime is 642697603. The next prime is 642697639. The reversal of 642697604 is 406796246.

It can be written as a sum of positive squares in only one way, i.e., 519931204 + 122766400 = 22802^2 + 11080^2 .

It is not an unprimeable number, because it can be changed into a prime (642697603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80337197 + ... + 80337204.

It is an arithmetic number, because the mean of its divisors is an integer number (187453469).

Almost surely, 2^642697604 is an apocalyptic number.

It is an amenable number.

642697604 is a deficient number, since it is larger than the sum of its proper divisors (482023210).

642697604 is a wasteful number, since it uses less digits than its factorization.

642697604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160674405 (or 160674403 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 44.

The square root of 642697604 is about 25351.4812979439. The cubic root of 642697604 is about 862.9829729081.

The spelling of 642697604 in words is "six hundred forty-two million, six hundred ninety-seven thousand, six hundred four".