642661360 has 40 divisors (see below), whose sum is σ = 1630025136. Its totient is φ = 233694720.

The previous prime is 642661321. The next prime is 642661379. The reversal of 642661360 is 63166246.

It is a tau number, because it is divible by the number of its divisors (40).

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, 364269 + ... + 366028.

Almost surely, 2^642661360 is an apocalyptic number.

It is an amenable number.

642661360 is an abundant number, since it is smaller than the sum of its proper divisors (987363776).

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

642661360 is a wasteful number, since it uses less digits than its factorization.

642661360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 730321 (or 730315 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 34.

The square root of 642661360 is about 25350.7664578411. The cubic root of 642661360 is about 862.9667503784.

The spelling of 642661360 in words is "six hundred forty-two million, six hundred sixty-one thousand, three hundred sixty".