642504245 has 16 divisors (see below), whose sum is σ = 785538432. Its totient is φ = 504398400.

The previous prime is 642504229. The next prime is 642504253. The reversal of 642504245 is 542405246.

It is not a de Polignac number, because 642504245 - 2⁴ = 642504229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57539 + ... + 67791.

It is an arithmetic number, because the mean of its divisors is an integer number (49096152).

Almost surely, 2^642504245 is an apocalyptic number.

It is an amenable number.

642504245 is a deficient number, since it is larger than the sum of its proper divisors (143034187).

642504245 is a wasteful number, since it uses less digits than its factorization.

642504245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10492.

The product of its (nonzero) digits is 38400, while the sum is 32.

The square root of 642504245 is about 25347.6674469269. The cubic root of 642504245 is about 862.8964198851.

The spelling of 642504245 in words is "six hundred forty-two million, five hundred four thousand, two hundred forty-five".