645207412 has 12 divisors (see below), whose sum is σ = 1129665600. Its totient is φ = 322445816.

The previous prime is 645207401. The next prime is 645207413. The reversal of 645207412 is 214702546.

645207412 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645207413) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30028 + ... + 46819.

It is an arithmetic number, because the mean of its divisors is an integer number (94138800).

Almost surely, 2^645207412 is an apocalyptic number.

It is an amenable number.

645207412 is a deficient number, since it is larger than the sum of its proper divisors (484458188).

645207412 is a wasteful number, since it uses less digits than its factorization.

645207412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78950 (or 78948 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 31.

The square root of 645207412 is about 25400.9332899404. The cubic root of 645207412 is about 864.1048630297.

Adding to 645207412 its reverse (214702546), we get a palindrome (859909958).

The spelling of 645207412 in words is "six hundred forty-five million, two hundred seven thousand, four hundred twelve".