645834783 has 8 divisors (see below), whose sum is σ = 939396096. Its totient is φ = 391415000.

The previous prime is 645834781. The next prime is 645834809. The reversal of 645834783 is 387438546.

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 645834783 - 2¹ = 645834781 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645834781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9785343 + ... + 9785408.

It is an arithmetic number, because the mean of its divisors is an integer number (117424512).

Almost surely, 2^645834783 is an apocalyptic number.

645834783 is a deficient number, since it is larger than the sum of its proper divisors (293561313).

645834783 is a wasteful number, since it uses less digits than its factorization.

645834783 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19570765.

The product of its digits is 1935360, while the sum is 48.

The square root of 645834783 is about 25413.2796584778. The cubic root of 645834783 is about 864.3848446849.

The spelling of 645834783 in words is "six hundred forty-five million, eight hundred thirty-four thousand, seven hundred eighty-three".