645001245 has 64 divisors (see below), whose sum is σ = 1325376000. Its totient is φ = 291506688.

The previous prime is 645001241. The next prime is 645001271. The reversal of 645001245 is 542100546.

645001245 is a `hidden beast` number, since 645 + 0 + 0 + 12 + 4 + 5 = 666.

645001245 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 645001245 - 2² = 645001241 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645001241) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 80271 + ... + 87939.

It is an arithmetic number, because the mean of its divisors is an integer number (20709000).

Almost surely, 2^645001245 is an apocalyptic number.

It is an amenable number.

645001245 is an abundant number, since it is smaller than the sum of its proper divisors (680374755).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645001245 is a wasteful number, since it uses less digits than its factorization.

645001245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7779 (or 7773 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 645001245 is about 25396.8747093023. The cubic root of 645001245 is about 864.0128156857.

The spelling of 645001245 in words is "six hundred forty-five million, one thousand, two hundred forty-five".