645752070 has 48 divisors (see below), whose sum is σ = 1718011152. Its totient is φ = 168194880.

The previous prime is 645752033. The next prime is 645752101. The reversal of 645752070 is 70257546.

645752070 is a `hidden beast` number, since 64 + 5 + 7 + 520 + 70 = 666.

645752070 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 an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 79561 + ... + 87300.

It is an arithmetic number, because the mean of its divisors is an integer number (35791899).

Almost surely, 2^645752070 is an apocalyptic number.

645752070 is an abundant number, since it is smaller than the sum of its proper divisors (1072259082).

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

645752070 is a wasteful number, since it uses less digits than its factorization.

645752070 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166917 (or 166914 counting only the distinct ones).

The product of its (nonzero) digits is 58800, while the sum is 36.

The square root of 645752070 is about 25411.6522485257. The cubic root of 645752070 is about 864.3479421014.

The spelling of 645752070 in words is "six hundred forty-five million, seven hundred fifty-two thousand, seventy".