728654581 has 2 divisors, whose sum is σ = 728654582. Its totient is φ = 728654580.

The previous prime is 728654569. The next prime is 728654657. The reversal of 728654581 is 185456827.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 728460100 + 194481 = 26990^2 + 441^2 .

It is a cyclic number.

It is not a de Polignac number, because 728654581 - 2¹⁵ = 728621813 is a prime.

It is a super-2 number, since 2×728654581² = 1061874996824571122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (728654281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 364327290 + 364327291.

It is an arithmetic number, because the mean of its divisors is an integer number (364327291).

Almost surely, 2^728654581 is an apocalyptic number.

It is an amenable number.

728654581 is a deficient number, since it is larger than the sum of its proper divisors (1).

728654581 is an equidigital number, since it uses as much as digits as its factorization.

728654581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 537600, while the sum is 46.

The square root of 728654581 is about 26993.6025939481. The cubic root of 728654581 is about 899.8578298064.

The spelling of 728654581 in words is "seven hundred twenty-eight million, six hundred fifty-four thousand, five hundred eighty-one".