645236270 has 64 divisors (see below), whose sum is σ = 1365590016. Its totient is φ = 214897920.

The previous prime is 645236239. The next prime is 645236287. The reversal of 645236270 is 72632546.

645236270 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 645236270.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1098917 + ... + 1099503.

It is an arithmetic number, because the mean of its divisors is an integer number (21337344).

Almost surely, 2^645236270 is an apocalyptic number.

645236270 is an abundant number, since it is smaller than the sum of its proper divisors (720353746).

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

645236270 is a wasteful number, since it uses less digits than its factorization.

645236270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1025.

The product of its (nonzero) digits is 60480, while the sum is 35.

The square root of 645236270 is about 25401.5013335826. The cubic root of 645236270 is about 864.1177456913.

The spelling of 645236270 in words is "six hundred forty-five million, two hundred thirty-six thousand, two hundred seventy".