642481212 has 24 divisors (see below), whose sum is σ = 1499685376. Its totient is φ = 214080048.

The previous prime is 642481183. The next prime is 642481243. The reversal of 642481212 is 212184246.

It is a self number, because there is not a number n which added to its sum of digits gives 642481212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29493 + ... + 46419.

Almost surely, 2^642481212 is an apocalyptic number.

It is an amenable number.

642481212 is an abundant number, since it is smaller than the sum of its proper divisors (857204164).

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

642481212 is a wasteful number, since it uses less digits than its factorization.

642481212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20097 (or 20095 counting only the distinct ones).

The product of its digits is 6144, while the sum is 30.

The square root of 642481212 is about 25347.2131012465. The cubic root of 642481212 is about 862.8861084976.

The spelling of 642481212 in words is "six hundred forty-two million, four hundred eighty-one thousand, two hundred twelve".