646693360 has 40 divisors (see below), whose sum is σ = 1504792080. Its totient is φ = 258465792.

The previous prime is 646693357. The next prime is 646693361. The reversal of 646693360 is 63396646.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646693361) 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, 127024 + ... + 132016.

It is an arithmetic number, because the mean of its divisors is an integer number (37619802).

Almost surely, 2^646693360 is an apocalyptic number.

It is an amenable number.

646693360 is an abundant number, since it is smaller than the sum of its proper divisors (858098720).

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

646693360 is a wasteful number, since it uses less digits than its factorization.

646693360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6625 (or 6619 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 43.

The square root of 646693360 is about 25430.1663384257. The cubic root of 646693360 is about 864.7677147006.

The spelling of 646693360 in words is "six hundred forty-six million, six hundred ninety-three thousand, three hundred sixty".