728247647 has 2 divisors, whose sum is σ = 728247648. Its totient is φ = 728247646.

The previous prime is 728247631. The next prime is 728247659. The reversal of 728247647 is 746742827.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 728247647 - 2⁴ = 728247631 is a prime.

It is a super-2 number, since 2×728247647² = 1060689270722073218, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (728247677) 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 as a sum of consecutive naturals, namely, 364123823 + 364123824.

It is an arithmetic number, because the mean of its divisors is an integer number (364123824).

Almost surely, 2^728247647 is an apocalyptic number.

728247647 is a deficient number, since it is larger than the sum of its proper divisors (1).

728247647 is an equidigital number, since it uses as much as digits as its factorization.

728247647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1053696, while the sum is 47.

The square root of 728247647 is about 26986.0639404860. The cubic root of 728247647 is about 899.6902831413.

The spelling of 728247647 in words is "seven hundred twenty-eight million, two hundred forty-seven thousand, six hundred forty-seven".