642998260 has 12 divisors (see below), whose sum is σ = 1350296388. Its totient is φ = 257199296.

The previous prime is 642998243. The next prime is 642998267. The reversal of 642998260 is 62899246.

It can be written as a sum of positive squares in 2 ways, for example, as 334012176 + 308986084 = 18276^2 + 17578^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 642998260.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642998267) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16074937 + ... + 16074976.

It is an arithmetic number, because the mean of its divisors is an integer number (112524699).

Almost surely, 2^642998260 is an apocalyptic number.

It is an amenable number.

642998260 is an abundant number, since it is smaller than the sum of its proper divisors (707298128).

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

642998260 is a wasteful number, since it uses less digits than its factorization.

642998260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32149922 (or 32149920 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 46.

The square root of 642998260 is about 25357.4103567379. The cubic root of 642998260 is about 863.1175206636.

The spelling of 642998260 in words is "six hundred forty-two million, nine hundred ninety-eight thousand, two hundred sixty".