645582693 has 48 divisors (see below), whose sum is σ = 1035101760. Its totient is φ = 356638464.

The previous prime is 645582689. The next prime is 645582709. The reversal of 645582693 is 396285546.

It is not a de Polignac number, because 645582693 - 2² = 645582689 is a prime.

It is a super-2 number, since 2×645582693² = 833554027002264498, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645582683) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 688521 + ... + 689457.

It is an arithmetic number, because the mean of its divisors is an integer number (21564620).

Almost surely, 2^645582693 is an apocalyptic number.

It is an amenable number.

645582693 is a deficient number, since it is larger than the sum of its proper divisors (389519067).

645582693 is a wasteful number, since it uses less digits than its factorization.

645582693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1106 (or 1099 counting only the distinct ones).

The product of its digits is 1555200, while the sum is 48.

The square root of 645582693 is about 25408.3193659085. The cubic root of 645582693 is about 864.2723643526.

The spelling of 645582693 in words is "six hundred forty-five million, five hundred eighty-two thousand, six hundred ninety-three".