728140 has 36 divisors (see below), whose sum is σ = 1781136. Its totient is φ = 249312.

The previous prime is 728131. The next prime is 728173. The reversal of 728140 is 41827.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 609 + ... + 1351.

It is an arithmetic number, because the mean of its divisors is an integer number (49476).

2⁷²⁸¹⁴⁰ is an apocalyptic number.

728140 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 728140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (890568).

728140 is an abundant number, since it is smaller than the sum of its proper divisors (1052996).

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

728140 is a wasteful number, since it uses less digits than its factorization.

728140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 766 (or 757 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 22.

The square root of 728140 is about 853.3111976296. The cubic root of 728140 is about 89.9645951275.

Adding to 728140 its reverse (41827), we get a palindrome (769967).

It can be divided in two parts, 728 and 140, that added together give a palindrome (868).

The spelling of 728140 in words is "seven hundred twenty-eight thousand, one hundred forty".