728365091 has 4 divisors (see below), whose sum is σ = 748050672. Its totient is φ = 708679512.

The previous prime is 728365067. The next prime is 728365093. The reversal of 728365091 is 190563827.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 190563827 = 571 ⋅333737.

It is a cyclic number.

It is not a de Polignac number, because 728365091 - 2²² = 724170787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (728365093) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9842735 + ... + 9842808.

It is an arithmetic number, because the mean of its divisors is an integer number (187012668).

Almost surely, 2^728365091 is an apocalyptic number.

728365091 is a deficient number, since it is larger than the sum of its proper divisors (19685581).

728365091 is a wasteful number, since it uses less digits than its factorization.

728365091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19685580.

The product of its (nonzero) digits is 90720, while the sum is 41.

The square root of 728365091 is about 26988.2398648004. The cubic root of 728365091 is about 899.7386446873.

The spelling of 728365091 in words is "seven hundred twenty-eight million, three hundred sixty-five thousand, ninety-one".