645799460 has 12 divisors (see below), whose sum is σ = 1356178908. Its totient is φ = 258319776.

The previous prime is 645799439. The next prime is 645799481. The reversal of 645799460 is 64997546.

645799460 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (645799439) and next prime (645799481).

It can be written as a sum of positive squares in 2 ways, for example, as 384395236 + 261404224 = 19606^2 + 16168^2 .

It is a hoax number, since the sum of its digits (50) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 645799399 and 645799408.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16144967 + ... + 16145006.

It is an arithmetic number, because the mean of its divisors is an integer number (113014909).

Almost surely, 2^645799460 is an apocalyptic number.

It is an amenable number.

645799460 is an abundant number, since it is smaller than the sum of its proper divisors (710379448).

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

645799460 is a wasteful number, since it uses less digits than its factorization.

645799460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32289982 (or 32289980 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 50.

The square root of 645799460 is about 25412.5846776750. The cubic root of 645799460 is about 864.3690856377.

The spelling of 645799460 in words is "six hundred forty-five million, seven hundred ninety-nine thousand, four hundred sixty".