728673009 has 8 divisors (see below), whose sum is σ = 1022699040. Its totient is φ = 460214496.

The previous prime is 728672983. The next prime is 728673017. The reversal of 728673009 is 900376827.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 728673009 - 2⁷ = 728672881 is a prime.

It is a super-2 number, since 2×728673009² = 1061928708090228162, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (728673109) 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, 6391812 + ... + 6391925.

It is an arithmetic number, because the mean of its divisors is an integer number (127837380).

Almost surely, 2^728673009 is an apocalyptic number.

It is an amenable number.

728673009 is a deficient number, since it is larger than the sum of its proper divisors (294026031).

728673009 is a wasteful number, since it uses less digits than its factorization.

728673009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12783759.

The product of its (nonzero) digits is 127008, while the sum is 42.

The square root of 728673009 is about 26993.9439319267. The cubic root of 728673009 is about 899.8654156780.

The spelling of 728673009 in words is "seven hundred twenty-eight million, six hundred seventy-three thousand, nine".