642625212 has 48 divisors (see below), whose sum is σ = 1545052320. Its totient is φ = 207787008.

The previous prime is 642625171. The next prime is 642625223. The reversal of 642625212 is 212526246.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 642625212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50928 + ... + 62280.

It is an arithmetic number, because the mean of its divisors is an integer number (32188590).

Almost surely, 2^642625212 is an apocalyptic number.

It is an amenable number.

642625212 is an abundant number, since it is smaller than the sum of its proper divisors (902427108).

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

642625212 is a wasteful number, since it uses less digits than its factorization.

642625212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11502 (or 11500 counting only the distinct ones).

The product of its digits is 11520, while the sum is 30.

The square root of 642625212 is about 25350.0534910678. The cubic root of 642625212 is about 862.9505702101.

The spelling of 642625212 in words is "six hundred forty-two million, six hundred twenty-five thousand, two hundred twelve".