28699785504 has 216 divisors, whose sum is σ = 91427967540. Its totient is φ = 8525776896.

The previous prime is 28699785481. The next prime is 28699785553. The reversal of 28699785504 is 40558799682.

28699785504 is a `hidden beast` number, since 2 + 8 + 6 + 9 + 9 + 78 + 550 + 4 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 12148448400 + 16551337104 = 110220^2 + 128652^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1401322 + ... + 1421654.

Almost surely, 2^28699785504 is an apocalyptic number.

28699785504 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28699785504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45713983770).

28699785504 is an abundant number, since it is smaller than the sum of its proper divisors (62728182036).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28699785504 is a wasteful number, since it uses less digits than its factorization.

28699785504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20404 (or 20380 counting only the distinct ones).

The product of its (nonzero) digits is 43545600, while the sum is 63.

The spelling of 28699785504 in words is "twenty-eight billion, six hundred ninety-nine million, seven hundred eighty-five thousand, five hundred four".