728787439 has 2 divisors, whose sum is σ = 728787440. Its totient is φ = 728787438.

The previous prime is 728787421. The next prime is 728787469. The reversal of 728787439 is 934787827.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 728787439 - 2¹⁷ = 728656367 is a prime.

It is a super-2 number, since 2×728787439² = 1062262262488357442, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 728787439.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (728787469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 364393719 + 364393720.

It is an arithmetic number, because the mean of its divisors is an integer number (364393720).

Almost surely, 2^728787439 is an apocalyptic number.

728787439 is a deficient number, since it is larger than the sum of its proper divisors (1).

728787439 is an equidigital number, since it uses as much as digits as its factorization.

728787439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4741632, while the sum is 55.

The square root of 728787439 is about 26996.0633982068. The cubic root of 728787439 is about 899.9125178342.

The spelling of 728787439 in words is "seven hundred twenty-eight million, seven hundred eighty-seven thousand, four hundred thirty-nine".