645772735 has 8 divisors (see below), whose sum is σ = 775068480. Its totient is φ = 516524064.

The previous prime is 645772669. The next prime is 645772793. The reversal of 645772735 is 537277546.

It is a happy number.

645772735 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

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 645772735 - 2⁹ = 645772223 is a prime.

It is a congruent number.

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, 36189 + ... + 51001.

It is an arithmetic number, because the mean of its divisors is an integer number (96883560).

Almost surely, 2^645772735 is an apocalyptic number.

645772735 is a deficient number, since it is larger than the sum of its proper divisors (129295745).

645772735 is a wasteful number, since it uses less digits than its factorization.

645772735 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23537.

The product of its digits is 1234800, while the sum is 46.

The square root of 645772735 is about 25412.0588500814. The cubic root of 645772735 is about 864.3571621310.

The spelling of 645772735 in words is "six hundred forty-five million, seven hundred seventy-two thousand, seven hundred thirty-five".