645739230 has 32 divisors (see below), whose sum is σ = 1603216800. Its totient is φ = 166259072.

The previous prime is 645739219. The next prime is 645739231. The reversal of 645739230 is 32937546.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645739231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 370245 + ... + 371984.

It is an arithmetic number, because the mean of its divisors is an integer number (50100525).

Almost surely, 2^645739230 is an apocalyptic number.

645739230 is an abundant number, since it is smaller than the sum of its proper divisors (957477570).

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

645739230 is a wasteful number, since it uses less digits than its factorization.

645739230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 742268.

The product of its (nonzero) digits is 136080, while the sum is 39.

The square root of 645739230 is about 25411.3996072629. The cubic root of 645739230 is about 864.3422132251.

The spelling of 645739230 in words is "six hundred forty-five million, seven hundred thirty-nine thousand, two hundred thirty".