729428 has 24 divisors (see below), whose sum is σ = 1478400. Its totient is φ = 308448.

The previous prime is 729413. The next prime is 729451. The reversal of 729428 is 824927.

It is a junction number, because it is equal to n+sod(n) for n = 729394 and 729403.

It is a congruent number.

It is an unprimeable number.

729428 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 7 ways as a sum of consecutive naturals, for example, 2933 + ... + 3171.

It is an arithmetic number, because the mean of its divisors is an integer number (61600).

2⁷²⁹⁴²⁸ is an apocalyptic number.

It is an amenable number.

729428 is an abundant number, since it is smaller than the sum of its proper divisors (748972).

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

729428 is a wasteful number, since it uses less digits than its factorization.

729428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 359 (or 357 counting only the distinct ones).

The product of its digits is 8064, while the sum is 32.

The square root of 729428 is about 854.0655712532. The cubic root of 729428 is about 90.0176097229.

The spelling of 729428 in words is "seven hundred twenty-nine thousand, four hundred twenty-eight".