728357131329 has 32 divisors (see below), whose sum is σ = 1035375719040. Its totient is φ = 453852951552.

The previous prime is 728357131309. The next prime is 728357131343. The reversal of 728357131329 is 923131753827.

728357131329 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 728357131329 - 2⁹ = 728357130817 is a prime.

It is a super-2 number, since 2×728357131329² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (728357131309) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15454002 + ... + 15501060.

It is an arithmetic number, because the mean of its divisors is an integer number (32355491220).

Almost surely, 2^728357131329 is an apocalyptic number.

It is an amenable number.

728357131329 is a deficient number, since it is larger than the sum of its proper divisors (307018587711).

728357131329 is a wasteful number, since it uses less digits than its factorization.

728357131329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49169.

The product of its digits is 1905120, while the sum is 51.

The spelling of 728357131329 in words is "seven hundred twenty-eight billion, three hundred fifty-seven million, one hundred thirty-one thousand, three hundred twenty-nine".