645244412 has 12 divisors (see below), whose sum is σ = 1155437976. Its totient is φ = 315119280.

The previous prime is 645244399. The next prime is 645244423. The reversal of 645244412 is 214442546.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1875539 + ... + 1875882.

It is an arithmetic number, because the mean of its divisors is an integer number (96286498).

Almost surely, 2^645244412 is an apocalyptic number.

It is an amenable number.

645244412 is a deficient number, since it is larger than the sum of its proper divisors (510193564).

645244412 is a wasteful number, since it uses less digits than its factorization.

645244412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3751468 (or 3751466 counting only the distinct ones).

The product of its digits is 30720, while the sum is 32.

The square root of 645244412 is about 25401.6615991946. The cubic root of 645244412 is about 864.1213803377.

Adding to 645244412 its reverse (214442546), we get a palindrome (859686958).

The spelling of 645244412 in words is "six hundred forty-five million, two hundred forty-four thousand, four hundred twelve".