647542327 has 2 divisors, whose sum is σ = 647542328. Its totient is φ = 647542326.

The previous prime is 647542309. The next prime is 647542367. The reversal of 647542327 is 723245746.

It is a happy number.

It is an a-pointer prime, because the next prime (647542367) can be obtained adding 647542327 to its sum of digits (40).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 647542327 - 2⁷ = 647542199 is a prime.

It is a super-2 number, since 2×647542327² = 838622130513149858, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 647542327.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (647542307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323771163 + 323771164.

It is an arithmetic number, because the mean of its divisors is an integer number (323771164).

Almost surely, 2^647542327 is an apocalyptic number.

647542327 is a deficient number, since it is larger than the sum of its proper divisors (1).

647542327 is an equidigital number, since it uses as much as digits as its factorization.

647542327 is an evil number, because the sum of its binary digits is even.

The product of its digits is 282240, while the sum is 40.

The square root of 647542327 is about 25446.8529881398. The cubic root of 647542327 is about 865.1459662122.

It can be divided in two parts, 64754 and 2327, that added together give a square (67081 = 259²).

The spelling of 647542327 in words is "six hundred forty-seven million, five hundred forty-two thousand, three hundred twenty-seven".