728770 has 32 divisors (see below), whose sum is σ = 1555200. Its totient is φ = 240576.

The previous prime is 728747. The next prime is 728771. The reversal of 728770 is 77827.

728770 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×728770² = 1062211425800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (728771) by changing a digit.

728770 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1851 + ... + 2209.

It is an arithmetic number, because the mean of its divisors is an integer number (48600).

2⁷²⁸⁷⁷⁰ is an apocalyptic number.

728770 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

728770 is an abundant number, since it is smaller than the sum of its proper divisors (826430).

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

728770 is a wasteful number, since it uses less digits than its factorization.

728770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402.

The product of its (nonzero) digits is 5488, while the sum is 31.

The square root of 728770 is about 853.6802680161. The cubic root of 728770 is about 89.9905339838.

The spelling of 728770 in words is "seven hundred twenty-eight thousand, seven hundred seventy".