642655272 has 32 divisors (see below), whose sum is σ = 1836158400. Its totient is φ = 183615744.

The previous prime is 642655261. The next prime is 642655289. The reversal of 642655272 is 272556246.

It is a self number, because there is not a number n which added to its sum of digits gives 642655272.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1912497 + ... + 1912832.

It is an arithmetic number, because the mean of its divisors is an integer number (57379950).

Almost surely, 2^642655272 is an apocalyptic number.

It is an amenable number.

642655272 is an abundant number, since it is smaller than the sum of its proper divisors (1193503128).

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

642655272 is a wasteful number, since it uses less digits than its factorization.

642655272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3825345 (or 3825341 counting only the distinct ones).

The product of its digits is 201600, while the sum is 39.

The square root of 642655272 is about 25350.6463822917. The cubic root of 642655272 is about 862.9640253776.

The spelling of 642655272 in words is "six hundred forty-two million, six hundred fifty-five thousand, two hundred seventy-two".