642246140 has 24 divisors (see below), whose sum is σ = 1381614192. Its totient is φ = 250632320.

The previous prime is 642246119. The next prime is 642246197. The reversal of 642246140 is 41642246.

It is a happy number.

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, 390794 + ... + 392433.

It is an arithmetic number, because the mean of its divisors is an integer number (57567258).

Almost surely, 2^642246140 is an apocalyptic number.

It is an amenable number.

642246140 is an abundant number, since it is smaller than the sum of its proper divisors (739368052).

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

642246140 is a wasteful number, since it uses less digits than its factorization.

642246140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 783277 (or 783275 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 29.

The square root of 642246140 is about 25342.5756386363. The cubic root of 642246140 is about 862.7808576342.

Adding to 642246140 its reverse (41642246), we get a palindrome (683888386).

The spelling of 642246140 in words is "six hundred forty-two million, two hundred forty-six thousand, one hundred forty".