642115604 has 24 divisors (see below), whose sum is σ = 1212294888. Its totient is φ = 295833600.

The previous prime is 642115597. The next prime is 642115627. The reversal of 642115604 is 406511246.

It can be written as a sum of positive squares in 4 ways, for example, as 95023504 + 547092100 = 9748^2 + 23390^2 .

It is a congruent number.

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, 19304 + ... + 40704.

It is an arithmetic number, because the mean of its divisors is an integer number (50512287).

Almost surely, 2^642115604 is an apocalyptic number.

It is an amenable number.

642115604 is a deficient number, since it is larger than the sum of its proper divisors (570179284).

642115604 is a wasteful number, since it uses less digits than its factorization.

642115604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21995 (or 21993 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 642115604 is about 25340.0000789266. Note that the first 4 decimals coincide. The cubic root of 642115604 is about 862.7224005068.

The spelling of 642115604 in words is "six hundred forty-two million, one hundred fifteen thousand, six hundred four".