728682931 has 4 divisors (see below), whose sum is σ = 752188864. Its totient is φ = 705177000.

The previous prime is 728682923. The next prime is 728682943. The reversal of 728682931 is 139286827.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 139286827 = 23 ⋅6055949.

It is a cyclic number.

It is not a de Polignac number, because 728682931 - 2³ = 728682923 is a prime.

It is a super-2 number, since 2×728682931² = 1061957627861501522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (728682991) 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, 11752920 + ... + 11752981.

It is an arithmetic number, because the mean of its divisors is an integer number (188047216).

Almost surely, 2^728682931 is an apocalyptic number.

728682931 is a deficient number, since it is larger than the sum of its proper divisors (23505933).

728682931 is a wasteful number, since it uses less digits than its factorization.

728682931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23505932.

The product of its digits is 290304, while the sum is 46.

The square root of 728682931 is about 26994.1277132639. The cubic root of 728682931 is about 899.8695000085.

The spelling of 728682931 in words is "seven hundred twenty-eight million, six hundred eighty-two thousand, nine hundred thirty-one".