645332270 has 64 divisors (see below), whose sum is σ = 1322237952. Its totient is φ = 224640000.

The previous prime is 645332269. The next prime is 645332287. The reversal of 645332270 is 72233546.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 329795 + ... + 331745.

It is an arithmetic number, because the mean of its divisors is an integer number (20659968).

Almost surely, 2^645332270 is an apocalyptic number.

645332270 is an abundant number, since it is smaller than the sum of its proper divisors (676905682).

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

645332270 is a wasteful number, since it uses less digits than its factorization.

645332270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2097.

The product of its (nonzero) digits is 30240, while the sum is 32.

The square root of 645332270 is about 25403.3909153877. The cubic root of 645332270 is about 864.1605988257.

The spelling of 645332270 in words is "six hundred forty-five million, three hundred thirty-two thousand, two hundred seventy".