728931 has 16 divisors (see below), whose sum is σ = 1124864. Its totient is φ = 411264.

The previous prime is 728929. The next prime is 728941. The reversal of 728931 is 139827.

It is a happy number.

It is not a de Polignac number, because 728931 - 2¹ = 728929 is a prime.

It is a super-2 number, since 2×728931² = 1062680805522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 728931.

It is not an unprimeable number, because it can be changed into a prime (728911) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1995 + ... + 2331.

It is an arithmetic number, because the mean of its divisors is an integer number (70304).

2⁷²⁸⁹³¹ is an apocalyptic number.

728931 is a deficient number, since it is larger than the sum of its proper divisors (395933).

728931 is a wasteful number, since it uses less digits than its factorization.

728931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 450.

The product of its digits is 3024, while the sum is 30.

The square root of 728931 is about 853.7745604081. The cubic root of 728931 is about 89.9971604042.

The spelling of 728931 in words is "seven hundred twenty-eight thousand, nine hundred thirty-one".