728551491 has 8 divisors (see below), whose sum is σ = 1002737664. Its totient is φ = 470033160.

The previous prime is 728551489. The next prime is 728551493. The reversal of 728551491 is 194155827.

It is an interprime number because it is at equal distance from previous prime (728551489) and next prime (728551493).

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

It is not a de Polignac number, because 728551491 - 2¹ = 728551489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (728551493) 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, 3916851 + ... + 3917036.

It is an arithmetic number, because the mean of its divisors is an integer number (125342208).

Almost surely, 2^728551491 is an apocalyptic number.

728551491 is a deficient number, since it is larger than the sum of its proper divisors (274186173).

728551491 is a wasteful number, since it uses less digits than its factorization.

728551491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7833921.

The product of its digits is 100800, while the sum is 42.

The square root of 728551491 is about 26991.6929998842. The cubic root of 728551491 is about 899.8153905303.

The spelling of 728551491 in words is "seven hundred twenty-eight million, five hundred fifty-one thousand, four hundred ninety-one".