728405567 has 2 divisors, whose sum is σ = 728405568. Its totient is φ = 728405566.

The previous prime is 728405519. The next prime is 728405611. The reversal of 728405567 is 765504827.

It is an a-pointer prime, because the next prime (728405611) can be obtained adding 728405567 to its sum of digits (44).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 728405567 - 2²⁸ = 459970111 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (728405507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 364202783 + 364202784.

It is an arithmetic number, because the mean of its divisors is an integer number (364202784).

Almost surely, 2^728405567 is an apocalyptic number.

728405567 is a deficient number, since it is larger than the sum of its proper divisors (1).

728405567 is an equidigital number, since it uses as much as digits as its factorization.

728405567 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 470400, while the sum is 44.

The square root of 728405567 is about 26988.9897365574. The cubic root of 728405567 is about 899.7553108470.

The spelling of 728405567 in words is "seven hundred twenty-eight million, four hundred five thousand, five hundred sixty-seven".