645833375 has 32 divisors (see below), whose sum is σ = 890023680. Its totient is φ = 463956000.

The previous prime is 645833369. The next prime is 645833407. The reversal of 645833375 is 573338546.

It is not a de Polignac number, because 645833375 - 2⁴ = 645833359 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 111296 + ... + 116954.

It is an arithmetic number, because the mean of its divisors is an integer number (27813240).

Almost surely, 2^645833375 is an apocalyptic number.

645833375 is the 20750-th pentagonal number.

645833375 is a deficient number, since it is larger than the sum of its proper divisors (244190305).

645833375 is a wasteful number, since it uses less digits than its factorization.

645833375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5768 (or 5758 counting only the distinct ones).

The product of its digits is 907200, while the sum is 44.

The square root of 645833375 is about 25413.2519564105. The cubic root of 645833375 is about 864.3842165290.

The spelling of 645833375 in words is "six hundred forty-five million, eight hundred thirty-three thousand, three hundred seventy-five".