645764793 has 8 divisors (see below), whose sum is σ = 869896608. Its totient is φ = 426071424.

The previous prime is 645764753. The next prime is 645764803. The reversal of 645764793 is 397467546.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 645764793 - 2⁶ = 645764729 is a prime.

It is not an unprimeable number, because it can be changed into a prime (645764753) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1109271 + ... + 1109852.

It is an arithmetic number, because the mean of its divisors is an integer number (108737076).

Almost surely, 2^645764793 is an apocalyptic number.

It is an amenable number.

645764793 is a deficient number, since it is larger than the sum of its proper divisors (224131815).

645764793 is a wasteful number, since it uses less digits than its factorization.

645764793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2219223.

The product of its digits is 3810240, while the sum is 51.

The square root of 645764793 is about 25411.9025852060. The cubic root of 645764793 is about 864.3536187004.

The spelling of 645764793 in words is "six hundred forty-five million, seven hundred sixty-four thousand, seven hundred ninety-three".