642981244 has 24 divisors (see below), whose sum is σ = 1152889920. Its totient is φ = 313628736.

The previous prime is 642981221. The next prime is 642981247. The reversal of 642981244 is 442189246.

It is a super-3 number, since 3×642981244³ (a number of 27 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 642981197 and 642981206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642981247) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54202 + ... + 64990.

It is an arithmetic number, because the mean of its divisors is an integer number (48037080).

Almost surely, 2^642981244 is an apocalyptic number.

It is an amenable number.

642981244 is a deficient number, since it is larger than the sum of its proper divisors (509908676).

642981244 is a wasteful number, since it uses less digits than its factorization.

642981244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11157 (or 11155 counting only the distinct ones).

The product of its digits is 110592, while the sum is 40.

The square root of 642981244 is about 25357.0748312971. The cubic root of 642981244 is about 863.1099068860.

The spelling of 642981244 in words is "six hundred forty-two million, nine hundred eighty-one thousand, two hundred forty-four".