645382385 has 8 divisors (see below), whose sum is σ = 801164520. Its totient is φ = 498502144.

The previous prime is 645382357. The next prime is 645382393. The reversal of 645382385 is 583283546.

It can be written as a sum of positive squares in 4 ways, for example, as 94400656 + 550981729 = 9716^2 + 23473^2 .

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 645382385 - 2¹⁶ = 645316849 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2225312 + ... + 2225601.

It is an arithmetic number, because the mean of its divisors is an integer number (100145565).

Almost surely, 2^645382385 is an apocalyptic number.

It is an amenable number.

645382385 is a deficient number, since it is larger than the sum of its proper divisors (155782135).

645382385 is a wasteful number, since it uses less digits than its factorization.

645382385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4450947.

The product of its digits is 691200, while the sum is 44.

The square root of 645382385 is about 25404.3772803035. The cubic root of 645382385 is about 864.1829678127.

The spelling of 645382385 in words is "six hundred forty-five million, three hundred eighty-two thousand, three hundred eighty-five".