728096391 has 32 divisors (see below), whose sum is σ = 1188195840. Its totient is φ = 436968000.

The previous prime is 728096381. The next prime is 728096399. The reversal of 728096391 is 193690827.

728096391 is a `hidden beast` number, since 7 + 2 + 8 + 0 + 9 + 639 + 1 = 666.

It is not a de Polignac number, because 728096391 - 2⁷ = 728096263 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728096399) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18691 + ... + 42491.

It is an arithmetic number, because the mean of its divisors is an integer number (37131120).

Almost surely, 2^728096391 is an apocalyptic number.

728096391 is a deficient number, since it is larger than the sum of its proper divisors (460099449).

728096391 is a wasteful number, since it uses less digits than its factorization.

728096391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23924 (or 23918 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 45.

The square root of 728096391 is about 26983.2613114130. The cubic root of 728096391 is about 899.6279906979.

The spelling of 728096391 in words is "seven hundred twenty-eight million, ninety-six thousand, three hundred ninety-one".