645470307 has 24 divisors (see below), whose sum is σ = 947092848. Its totient is φ = 423532800.

The previous prime is 645470279. The next prime is 645470323. The reversal of 645470307 is 703074546.

645470307 is a `hidden beast` number, since 645 + 4 + 7 + 0 + 3 + 0 + 7 = 666.

It is not a de Polignac number, because 645470307 - 2⁷ = 645470179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (645477307) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 499332 + ... + 500622.

It is an arithmetic number, because the mean of its divisors is an integer number (39462202).

Almost surely, 2^645470307 is an apocalyptic number.

645470307 is a deficient number, since it is larger than the sum of its proper divisors (301622541).

645470307 is a wasteful number, since it uses less digits than its factorization.

645470307 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2131 (or 2128 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 36.

The square root of 645470307 is about 25406.1076711880. The cubic root of 645470307 is about 864.2222092746. Note that the first 4 decimals are identical.

The spelling of 645470307 in words is "six hundred forty-five million, four hundred seventy thousand, three hundred seven".