728551 has 2 divisors, whose sum is σ = 728552. Its totient is φ = 728550.

The previous prime is 728537. The next prime is 728557. The reversal of 728551 is 155827.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 728551 - 2⁷ = 728423 is a prime.

It is equal to p₅₈₆₇₂ and since 728551 and 58672 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (728557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 364275 + 364276.

It is an arithmetic number, because the mean of its divisors is an integer number (364276).

2⁷²⁸⁵⁵¹ is an apocalyptic number.

728551 is a deficient number, since it is larger than the sum of its proper divisors (1).

728551 is an equidigital number, since it uses as much as digits as its factorization.

728551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2800, while the sum is 28.

The square root of 728551 is about 853.5519902150. The cubic root of 728551 is about 89.9815188390.

The spelling of 728551 in words is "seven hundred twenty-eight thousand, five hundred fifty-one".