645813597 has 32 divisors (see below), whose sum is σ = 1013765760. Its totient is φ = 360529920.

The previous prime is 645813583. The next prime is 645813617. The reversal of 645813597 is 795318546.

It is not a de Polignac number, because 645813597 - 2⁸ = 645813341 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645813197) 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, 246229 + ... + 248837.

It is an arithmetic number, because the mean of its divisors is an integer number (31680180).

Almost surely, 2^645813597 is an apocalyptic number.

It is an amenable number.

645813597 is a deficient number, since it is larger than the sum of its proper divisors (367952163).

645813597 is a wasteful number, since it uses less digits than its factorization.

645813597 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3213.

The product of its digits is 907200, while the sum is 48.

The square root of 645813597 is about 25412.8628257424. The cubic root of 645813597 is about 864.3753928054.

The spelling of 645813597 in words is "six hundred forty-five million, eight hundred thirteen thousand, five hundred ninety-seven".