728122091287 has 2 divisors, whose sum is σ = 728122091288. Its totient is φ = 728122091286.

The previous prime is 728122091273. The next prime is 728122091299. The reversal of 728122091287 is 782190221827.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 728122091287 - 2³⁵ = 693762352919 is a prime.

It is a super-2 number, since 2×728122091287² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 728122091287.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (728122091387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 364061045643 + 364061045644.

It is an arithmetic number, because the mean of its divisors is an integer number (364061045644).

Almost surely, 2^728122091287 is an apocalyptic number.

728122091287 is a deficient number, since it is larger than the sum of its proper divisors (1).

728122091287 is an equidigital number, since it uses as much as digits as its factorization.

728122091287 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 451584, while the sum is 49.

The spelling of 728122091287 in words is "seven hundred twenty-eight billion, one hundred twenty-two million, ninety-one thousand, two hundred eighty-seven".