728156405 has 8 divisors (see below), whose sum is σ = 880668672. Its totient is φ = 577937808.

The previous prime is 728156353. The next prime is 728156413. The reversal of 728156405 is 504651827.

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

It is a cyclic number.

It is not a de Polignac number, because 728156405 - 2¹⁰ = 728155381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 572717 + ... + 573986.

It is an arithmetic number, because the mean of its divisors is an integer number (110083584).

Almost surely, 2^728156405 is an apocalyptic number.

It is an amenable number.

728156405 is a deficient number, since it is larger than the sum of its proper divisors (152512267).

728156405 is a wasteful number, since it uses less digits than its factorization.

728156405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1146835.

The product of its (nonzero) digits is 67200, while the sum is 38.

The square root of 728156405 is about 26984.3733482918. The cubic root of 728156405 is about 899.6527075677.

The spelling of 728156405 in words is "seven hundred twenty-eight million, one hundred fifty-six thousand, four hundred five".