728256631 has 2 divisors, whose sum is σ = 728256632. Its totient is φ = 728256630.

The previous prime is 728256611. The next prime is 728256673. The reversal of 728256631 is 136652827.

728256631 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 728256631 - 2⁹ = 728256119 is a prime.

It is a super-2 number, since 2×728256631² = 1060715441190940322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (728256611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 364128315 + 364128316.

It is an arithmetic number, because the mean of its divisors is an integer number (364128316).

Almost surely, 2^728256631 is an apocalyptic number.

728256631 is a deficient number, since it is larger than the sum of its proper divisors (1).

728256631 is an equidigital number, since it uses as much as digits as its factorization.

728256631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120960, while the sum is 40.

The square root of 728256631 is about 26986.2303962595. The cubic root of 728256631 is about 899.6939827914.

The spelling of 728256631 in words is "seven hundred twenty-eight million, two hundred fifty-six thousand, six hundred thirty-one".