640512360 has 80 divisors (see below), whose sum is σ = 2152844100. Its totient is φ = 170802432.

The previous prime is 640512343. The next prime is 640512361. The reversal of 640512360 is 63215046.

640512360 is a `hidden beast` number, since 640 + 5 + 12 + 3 + 6 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 632321316 + 8191044 = 25146^2 + 2862^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (640512361) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 95605 + ... + 102084.

Almost surely, 2^640512360 is an apocalyptic number.

640512360 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

640512360 is an abundant number, since it is smaller than the sum of its proper divisors (1512331740).

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

640512360 is a wasteful number, since it uses less digits than its factorization.

640512360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197712 (or 197699 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 640512360 is about 25308.3456590904. The cubic root of 640512360 is about 862.0037826217.

The spelling of 640512360 in words is "six hundred forty million, five hundred twelve thousand, three hundred sixty".