645739263 has 32 divisors (see below), whose sum is σ = 1084473600. Its totient is φ = 376459488.

The previous prime is 645739261. The next prime is 645739267. The reversal of 645739263 is 362937546.

It is not a de Polignac number, because 645739263 - 2¹ = 645739261 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645739261) 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, 41745 + ... + 55082.

It is an arithmetic number, because the mean of its divisors is an integer number (33889800).

Almost surely, 2^645739263 is an apocalyptic number.

645739263 is a deficient number, since it is larger than the sum of its proper divisors (438734337).

645739263 is a wasteful number, since it uses less digits than its factorization.

645739263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96868 (or 96862 counting only the distinct ones).

The product of its digits is 816480, while the sum is 45.

The square root of 645739263 is about 25411.4002565778. The cubic root of 645739263 is about 864.3422279490.

The spelling of 645739263 in words is "six hundred forty-five million, seven hundred thirty-nine thousand, two hundred sixty-three".