645276460 has 24 divisors (see below), whose sum is σ = 1368241056. Its totient is φ = 255603840.

The previous prime is 645276449. The next prime is 645276469. The reversal of 645276460 is 64672546.

It is not an unprimeable number, because it can be changed into a prime (645276469) 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, 154561 + ... + 158680.

It is an arithmetic number, because the mean of its divisors is an integer number (57010044).

Almost surely, 2^645276460 is an apocalyptic number.

It is an amenable number.

645276460 is an abundant number, since it is smaller than the sum of its proper divisors (722964596).

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

645276460 is a wasteful number, since it uses less digits than its factorization.

645276460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313353 (or 313351 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 40.

The square root of 645276460 is about 25402.2924162368. The cubic root of 645276460 is about 864.1356864947.

The spelling of 645276460 in words is "six hundred forty-five million, two hundred seventy-six thousand, four hundred sixty".