642524287 has 4 divisors (see below), whose sum is σ = 643066776. Its totient is φ = 641981800.

The previous prime is 642524279. The next prime is 642524293. The reversal of 642524287 is 782425246.

642524287 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 642524287 - 2³ = 642524279 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642524237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 269464 + ... + 271837.

It is an arithmetic number, because the mean of its divisors is an integer number (160766694).

Almost surely, 2^642524287 is an apocalyptic number.

642524287 is a deficient number, since it is larger than the sum of its proper divisors (542489).

642524287 is a wasteful number, since it uses less digits than its factorization.

642524287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 542488.

The product of its digits is 215040, while the sum is 40.

The square root of 642524287 is about 25348.0627859409. The cubic root of 642524287 is about 862.9053920646.

The spelling of 642524287 in words is "six hundred forty-two million, five hundred twenty-four thousand, two hundred eighty-seven".