642544254 has 48 divisors (see below), whose sum is σ = 1567747584. Its totient is φ = 188427600.

The previous prime is 642544237. The next prime is 642544267. The reversal of 642544254 is 452445246.

642544254 is a `hidden beast` number, since 64 + 2 + 544 + 2 + 54 = 666.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 46204 + ... + 58479.

It is an arithmetic number, because the mean of its divisors is an integer number (32661408).

Almost surely, 2^642544254 is an apocalyptic number.

642544254 is an abundant number, since it is smaller than the sum of its proper divisors (925203330).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

642544254 is a wasteful number, since it uses less digits than its factorization.

642544254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104733 (or 104730 counting only the distinct ones).

The product of its digits is 153600, while the sum is 36.

The square root of 642544254 is about 25348.4566394090. The cubic root of 642544254 is about 862.9143304834.

The spelling of 642544254 in words is "six hundred forty-two million, five hundred forty-four thousand, two hundred fifty-four".