642204814 has 4 divisors (see below), whose sum is σ = 963307224. Its totient is φ = 321102406.

The previous prime is 642204811. The next prime is 642204821. The reversal of 642204814 is 418402246.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642204811) 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, 160551202 + ... + 160551205.

It is an arithmetic number, because the mean of its divisors is an integer number (240826806).

Almost surely, 2^642204814 is an apocalyptic number.

642204814 is a deficient number, since it is larger than the sum of its proper divisors (321102410).

642204814 is a wasteful number, since it uses less digits than its factorization.

642204814 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321102409.

The product of its (nonzero) digits is 12288, while the sum is 31.

The square root of 642204814 is about 25341.7602782443. The cubic root of 642204814 is about 862.7623517248.

The spelling of 642204814 in words is "six hundred forty-two million, two hundred four thousand, eight hundred fourteen".