728364557169 has 24 divisors (see below), whose sum is σ = 1062867897000. Its totient is φ = 480601670400.

The previous prime is 728364557149. The next prime is 728364557183. The reversal of 728364557169 is 961755463827.

728364557169 is a `hidden beast` number, since 7 + 2 + 8 + 3 + 64 + 557 + 16 + 9 = 666.

728364557169 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 471227331600 + 257137225569 = 686460^2 + 507087^2 .

It is not a de Polignac number, because 728364557169 - 2¹² = 728364553073 is a prime.

It is a super-2 number, since 2×728364557169² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (728364557149) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2506557 + ... + 2782005.

It is an arithmetic number, because the mean of its divisors is an integer number (44286162375).

Almost surely, 2^728364557169 is an apocalyptic number.

It is an amenable number.

728364557169 is a deficient number, since it is larger than the sum of its proper divisors (334503339831).

728364557169 is a wasteful number, since it uses less digits than its factorization.

728364557169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278465 (or 278462 counting only the distinct ones).

The product of its digits is 76204800, while the sum is 63.

The spelling of 728364557169 in words is "seven hundred twenty-eight billion, three hundred sixty-four million, five hundred fifty-seven thousand, one hundred sixty-nine".