645474359 has 4 divisors (see below), whose sum is σ = 659207904. Its totient is φ = 631740816.

The previous prime is 645474311. The next prime is 645474383. The reversal of 645474359 is 953474546.

645474359 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-645474359 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47), and also a Moran number because the ratio is a prime number: 13733497 = 645474359 / (6 + 4 + 5 + 4 + 7 + 4 + 3 + 5 + 9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645474559) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6866702 + ... + 6866795.

It is an arithmetic number, because the mean of its divisors is an integer number (164801976).

Almost surely, 2^645474359 is an apocalyptic number.

645474359 is a deficient number, since it is larger than the sum of its proper divisors (13733545).

645474359 is a wasteful number, since it uses less digits than its factorization.

645474359 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13733544.

The product of its digits is 1814400, while the sum is 47.

The square root of 645474359 is about 25406.1874156671. The cubic root of 645474359 is about 864.2240176826.

The spelling of 645474359 in words is "six hundred forty-five million, four hundred seventy-four thousand, three hundred fifty-nine".