645900270 has 32 divisors (see below), whose sum is σ = 1557964800. Its totient is φ = 171372960.

The previous prime is 645900263. The next prime is 645900361. The reversal of 645900270 is 72009546.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48126 + ... + 60065.

It is an arithmetic number, because the mean of its divisors is an integer number (48686400).

Almost surely, 2^645900270 is an apocalyptic number.

645900270 is an abundant number, since it is smaller than the sum of its proper divisors (912064530).

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

645900270 is a wasteful number, since it uses less digits than its factorization.

645900270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108400.

The product of its (nonzero) digits is 15120, while the sum is 33.

The square root of 645900270 is about 25414.5680663670. The cubic root of 645900270 is about 864.4140596166.

The spelling of 645900270 in words is "six hundred forty-five million, nine hundred thousand, two hundred seventy".