28699235712 has 480 divisors, whose sum is σ = 105228632520. Its totient is φ = 7715119104.

The previous prime is 28699235699. The next prime is 28699235717. The reversal of 28699235712 is 21753299682.

28699235712 is a `hidden beast` number, since 2 + 8 + 69 + 9 + 2 + 3 + 571 + 2 = 666.

It is a super-2 number, since 2×28699235712² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28699235717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 8634883 + ... + 8638205.

Almost surely, 2^28699235712 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28699235712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52614316260).

28699235712 is an abundant number, since it is smaller than the sum of its proper divisors (76529396808).

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

28699235712 is a wasteful number, since it uses less digits than its factorization.

28699235712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3380 (or 3352 counting only the distinct ones).

The product of its digits is 3265920, while the sum is 54.

The spelling of 28699235712 in words is "twenty-eight billion, six hundred ninety-nine million, two hundred thirty-five thousand, seven hundred twelve".