728670 has 32 divisors (see below), whose sum is σ = 1772928. Its totient is φ = 191648.

The previous prime is 728659. The next prime is 728681. The reversal of 728670 is 76827.

It is an interprime number because it is at equal distance from previous prime (728659) and next prime (728681).

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

It is a congruent number.

It is an unprimeable number.

728670 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, 3097 + ... + 3323.

It is an arithmetic number, because the mean of its divisors is an integer number (55404).

2⁷²⁸⁶⁷⁰ is an apocalyptic number.

728670 is an abundant number, since it is smaller than the sum of its proper divisors (1044258).

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

728670 is a wasteful number, since it uses less digits than its factorization.

728670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344.

The product of its (nonzero) digits is 4704, while the sum is 30.

The square root of 728670 is about 853.6216960692. The cubic root of 728670 is about 89.9864177034.

The spelling of 728670 in words is "seven hundred twenty-eight thousand, six hundred seventy".