642538315 has 16 divisors (see below), whose sum is σ = 785217600. Its totient is φ = 504616320.

The previous prime is 642538313. The next prime is 642538349. The reversal of 642538315 is 513835246.

642538315 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 642538315 - 2¹ = 642538313 is a prime.

It is not an unprimeable number, because it can be changed into a prime (642538313) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 180937 + ... + 184453.

It is an arithmetic number, because the mean of its divisors is an integer number (49076100).

Almost surely, 2^642538315 is an apocalyptic number.

642538315 is a deficient number, since it is larger than the sum of its proper divisors (142679285).

642538315 is a wasteful number, since it uses less digits than its factorization.

642538315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4182.

The product of its digits is 86400, while the sum is 37.

The square root of 642538315 is about 25348.3394919667. The cubic root of 642538315 is about 862.9116718525.

The spelling of 642538315 in words is "six hundred forty-two million, five hundred thirty-eight thousand, three hundred fifteen".