642504247 has 32 divisors (see below), whose sum is σ = 845752320. Its totient is φ = 472871520.

The previous prime is 642504229. The next prime is 642504253. The reversal of 642504247 is 742405246.

It is a de Polignac number, because none of the positive numbers 2^k-642504247 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642504217) 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 31 ways as a sum of consecutive naturals, for example, 940368 + ... + 941050.

It is an arithmetic number, because the mean of its divisors is an integer number (26429760).

Almost surely, 2^642504247 is an apocalyptic number.

642504247 is a deficient number, since it is larger than the sum of its proper divisors (203248073).

642504247 is a wasteful number, since it uses less digits than its factorization.

642504247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1363.

The product of its (nonzero) digits is 53760, while the sum is 34.

The square root of 642504247 is about 25347.6674863783. The cubic root of 642504247 is about 862.8964207804.

Subtracting 642504247 from its reverse (742405246), we obtain a palindrome (99900999).

The spelling of 642504247 in words is "six hundred forty-two million, five hundred four thousand, two hundred forty-seven".