640072965 has 32 divisors (see below), whose sum is σ = 1208180736. Its totient is φ = 283164480.

The previous prime is 640072963. The next prime is 640072981. The reversal of 640072965 is 569270046.

It is not a de Polignac number, because 640072965 - 2¹ = 640072963 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640072963) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 95067 + ... + 101576.

It is an arithmetic number, because the mean of its divisors is an integer number (37755648).

Almost surely, 2^640072965 is an apocalyptic number.

It is an amenable number.

640072965 is a deficient number, since it is larger than the sum of its proper divisors (568107771).

640072965 is a wasteful number, since it uses less digits than its factorization.

640072965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196689.

The product of its (nonzero) digits is 90720, while the sum is 39.

The square root of 640072965 is about 25299.6633376810. The cubic root of 640072965 is about 861.8066244198.

The spelling of 640072965 in words is "six hundred forty million, seventy-two thousand, nine hundred sixty-five".