640345245 has 16 divisors (see below), whose sum is σ = 1034130240. Its totient is φ = 338324864.

The previous prime is 640345241. The next prime is 640345253. The reversal of 640345245 is 542543046.

640345245 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 640345245 - 2² = 640345241 is a prime.

It is a super-2 number, since 2×640345245² = 820084065588220050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640345241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 197880 + ... + 201089.

It is an arithmetic number, because the mean of its divisors is an integer number (64633140).

Almost surely, 2^640345245 is an apocalyptic number.

It is an amenable number.

640345245 is a deficient number, since it is larger than the sum of its proper divisors (393784995).

640345245 is a wasteful number, since it uses less digits than its factorization.

640345245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399084.

The product of its (nonzero) digits is 57600, while the sum is 33.

The square root of 640345245 is about 25305.0438648108. The cubic root of 640345245 is about 861.9288081162.

The spelling of 640345245 in words is "six hundred forty million, three hundred forty-five thousand, two hundred forty-five".