28551685329 has 32 divisors (see below), whose sum is σ = 45214444800. Its totient is φ = 17762785920.

The previous prime is 28551685297. The next prime is 28551685343. The reversal of 28551685329 is 92358615582.

It is a happy number.

28551685329 is a `hidden beast` number, since 2 + 8 + 551 + 6 + 85 + 3 + 2 + 9 = 666.

It is not a de Polignac number, because 28551685329 - 2⁵ = 28551685297 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28551685399) 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, 535234 + ... + 586155.

It is an arithmetic number, because the mean of its divisors is an integer number (1412951400).

Almost surely, 2^28551685329 is an apocalyptic number.

It is an amenable number.

28551685329 is a deficient number, since it is larger than the sum of its proper divisors (16662759471).

28551685329 is a wasteful number, since it uses less digits than its factorization.

28551685329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1121462 (or 1121456 counting only the distinct ones).

The product of its digits is 5184000, while the sum is 54.

The spelling of 28551685329 in words is "twenty-eight billion, five hundred fifty-one million, six hundred eighty-five thousand, three hundred twenty-nine".