645962268 has 48 divisors (see below), whose sum is σ = 1797465600. Its totient is φ = 176535744.

The previous prime is 645962263. The next prime is 645962279. The reversal of 645962268 is 862269546.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645962263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 165243 + ... + 169106.

It is an arithmetic number, because the mean of its divisors is an integer number (37447200).

Almost surely, 2^645962268 is an apocalyptic number.

It is an amenable number.

645962268 is an abundant number, since it is smaller than the sum of its proper divisors (1151503332).

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

645962268 is a wasteful number, since it uses less digits than its factorization.

645962268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334386 (or 334384 counting only the distinct ones).

The product of its digits is 1244160, while the sum is 48.

The square root of 645962268 is about 25415.7877705964. The cubic root of 645962268 is about 864.4417162228.

The spelling of 645962268 in words is "six hundred forty-five million, nine hundred sixty-two thousand, two hundred sixty-eight".