728251847 has 4 divisors (see below), whose sum is σ = 735759696. Its totient is φ = 720744000.

The previous prime is 728251841. The next prime is 728251883. The reversal of 728251847 is 748152827.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 748152827 = 25577 ⋅29251.

It is a cyclic number.

It is not a de Polignac number, because 728251847 - 2¹⁰ = 728250823 is a prime.

It is a super-2 number, since 2×728251847² = 1060701505317822818, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 728251798 and 728251807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728251841) 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 3 ways as a sum of consecutive naturals, for example, 3753779 + ... + 3753972.

It is an arithmetic number, because the mean of its divisors is an integer number (183939924).

Almost surely, 2^728251847 is an apocalyptic number.

728251847 is a deficient number, since it is larger than the sum of its proper divisors (7507849).

728251847 is an equidigital number, since it uses as much as digits as its factorization.

728251847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7507848.

The product of its digits is 250880, while the sum is 44.

The square root of 728251847 is about 26986.1417583174. The cubic root of 728251847 is about 899.6920127233.

The spelling of 728251847 in words is "seven hundred twenty-eight million, two hundred fifty-one thousand, eight hundred forty-seven".