728940 has 24 divisors (see below), whose sum is σ = 2041200. Its totient is φ = 194368.

The previous prime is 728929. The next prime is 728941. The reversal of 728940 is 49827.

728940 = 115² + 116² + ... + 154².

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 728898 and 728907.

It is not an unprimeable number, because it can be changed into a prime (728941) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6015 + ... + 6134.

It is an arithmetic number, because the mean of its divisors is an integer number (85050).

2⁷²⁸⁹⁴⁰ is an apocalyptic number.

It is an amenable number.

728940 is an abundant number, since it is smaller than the sum of its proper divisors (1312260).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

728940 is a wasteful number, since it uses less digits than its factorization.

728940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12161 (or 12159 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 728940 is about 853.7798311040. The cubic root of 728940 is about 89.9975307965.

The spelling of 728940 in words is "seven hundred twenty-eight thousand, nine hundred forty".