647255693 has 4 divisors (see below), whose sum is σ = 739720800. Its totient is φ = 554790588.

The previous prime is 647255657. The next prime is 647255701. The reversal of 647255693 is 396552746.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 647255693 - 2¹⁶ = 647190157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647255993) 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, 46232543 + ... + 46232556.

It is an arithmetic number, because the mean of its divisors is an integer number (184930200).

Almost surely, 2^647255693 is an apocalyptic number.

It is an amenable number.

647255693 is a deficient number, since it is larger than the sum of its proper divisors (92465107).

647255693 is an equidigital number, since it uses as much as digits as its factorization.

647255693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92465106.

The product of its digits is 1360800, while the sum is 47.

The square root of 647255693 is about 25441.2203520193. The cubic root of 647255693 is about 865.0182953574.

The spelling of 647255693 in words is "six hundred forty-seven million, two hundred fifty-five thousand, six hundred ninety-three".