645326383 has 8 divisors (see below), whose sum is σ = 695164176. Its totient is φ = 595516800.

The previous prime is 645326377. The next prime is 645326399. The reversal of 645326383 is 383623546.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 645326383 - 2⁹ = 645325871 is a prime.

It is a super-2 number, since 2×645326383² = 832892281191725378, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645326303) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87063 + ... + 94183.

It is an arithmetic number, because the mean of its divisors is an integer number (86895522).

Almost surely, 2^645326383 is an apocalyptic number.

645326383 is a deficient number, since it is larger than the sum of its proper divisors (49837793).

645326383 is a wasteful number, since it uses less digits than its factorization.

645326383 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14105.

The product of its digits is 311040, while the sum is 40.

The square root of 645326383 is about 25403.2750447654. The cubic root of 645326383 is about 864.1579710689.

The spelling of 645326383 in words is "six hundred forty-five million, three hundred twenty-six thousand, three hundred eighty-three".