645420232 has 48 divisors (see below), whose sum is σ = 1295957520. Its totient is φ = 301267200.

The previous prime is 645420211. The next prime is 645420233. The reversal of 645420232 is 232024546.

It is a self number, because there is not a number n which added to its sum of digits gives 645420232.

It is not an unprimeable number, because it can be changed into a prime (645420233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 301807 + ... + 303937.

It is an arithmetic number, because the mean of its divisors is an integer number (26999115).

Almost surely, 2^645420232 is an apocalyptic number.

It is an amenable number.

645420232 is an abundant number, since it is smaller than the sum of its proper divisors (650537288).

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

645420232 is a wasteful number, since it uses less digits than its factorization.

645420232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2302 (or 2281 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 28.

The square root of 645420232 is about 25405.1221606982. The cubic root of 645420232 is about 864.1998601720.

Adding to 645420232 its reverse (232024546), we get a palindrome (877444778).

The spelling of 645420232 in words is "six hundred forty-five million, four hundred twenty thousand, two hundred thirty-two".