645642360 has 128 divisors (see below), whose sum is σ = 2347833600. Its totient is φ = 156516480.

The previous prime is 645642353. The next prime is 645642367. The reversal of 645642360 is 63246546.

645642360 is a `hidden beast` number, since 6 + 4 + 5 + 642 + 3 + 6 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (645642353) and next prime (645642367).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645642367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15294 + ... + 39053.

It is an arithmetic number, because the mean of its divisors is an integer number (18342450).

Almost surely, 2^645642360 is an apocalyptic number.

645642360 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

645642360 is an abundant number, since it is smaller than the sum of its proper divisors (1702191240).

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

645642360 is a wasteful number, since it uses less digits than its factorization.

645642360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54378 (or 54368 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 36.

The square root of 645642360 is about 25409.4935014455. The cubic root of 645642360 is about 864.2989898859.

The spelling of 645642360 in words is "six hundred forty-five million, six hundred forty-two thousand, three hundred sixty".