645718012 has 24 divisors (see below), whose sum is σ = 1137290000. Its totient is φ = 320785920.

The previous prime is 645717991. The next prime is 645718013. The reversal of 645718012 is 210817546.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645718013) 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, 516364 + ... + 517612.

Almost surely, 2^645718012 is an apocalyptic number.

It is an amenable number.

645718012 is a deficient number, since it is larger than the sum of its proper divisors (491571988).

645718012 is a wasteful number, since it uses less digits than its factorization.

645718012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1981 (or 1979 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 645718012 is about 25410.9821140388. The cubic root of 645718012 is about 864.3327461353.

The spelling of 645718012 in words is "six hundred forty-five million, seven hundred eighteen thousand, twelve".