645276260 has 12 divisors (see below), whose sum is σ = 1355080188. Its totient is φ = 258110496.

The previous prime is 645276241. The next prime is 645276283. The reversal of 645276260 is 62672546.

It can be written as a sum of positive squares in 2 ways, for example, as 451732516 + 193543744 = 21254^2 + 13912^2 .

It is a super-4 number, since 4×645276260⁴ (a number of 36 digits) contains 4444 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16131887 + ... + 16131926.

It is an arithmetic number, because the mean of its divisors is an integer number (112923349).

Almost surely, 2^645276260 is an apocalyptic number.

It is an amenable number.

645276260 is an abundant number, since it is smaller than the sum of its proper divisors (709803928).

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

645276260 is a wasteful number, since it uses less digits than its factorization.

645276260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32263822 (or 32263820 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 38.

The square root of 645276260 is about 25402.2884795839. The cubic root of 645276260 is about 864.1355972166.

The spelling of 645276260 in words is "six hundred forty-five million, two hundred seventy-six thousand, two hundred sixty".