645826797 has 32 divisors (see below), whose sum is σ = 1192872960. Its totient is φ = 335493360.

The previous prime is 645826759. The next prime is 645826799. The reversal of 645826797 is 797628546.

It is not a de Polignac number, because 645826797 - 2⁶ = 645826733 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645826799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 153243 + ... + 157400.

It is an arithmetic number, because the mean of its divisors is an integer number (37277280).

Almost surely, 2^645826797 is an apocalyptic number.

It is an amenable number.

645826797 is a deficient number, since it is larger than the sum of its proper divisors (547046163).

645826797 is a wasteful number, since it uses less digits than its factorization.

645826797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310670 (or 310664 counting only the distinct ones).

The product of its digits is 5080320, while the sum is 54.

The square root of 645826797 is about 25413.1225354147. The cubic root of 645826797 is about 864.3812818512.

The spelling of 645826797 in words is "six hundred forty-five million, eight hundred twenty-six thousand, seven hundred ninety-seven".