28779856512 has 256 divisors, whose sum is σ = 88595959680. Its totient is φ = 8180858880.

The previous prime is 28779856439. The next prime is 28779856519. The reversal of 28779856512 is 21565897782.

It is a super-2 number, since 2×28779856512² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28779856519) 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, 32815818 + ... + 32816694.

Almost surely, 2^28779856512 is an apocalyptic number.

28779856512 is a gapful number since it is divisible by the number (22) 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 28779856512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44297979840).

28779856512 is an abundant number, since it is smaller than the sum of its proper divisors (59816103168).

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

28779856512 is a wasteful number, since it uses less digits than its factorization.

28779856512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1379 (or 1367 counting only the distinct ones).

The product of its digits is 16934400, while the sum is 60.

The spelling of 28779856512 in words is "twenty-eight billion, seven hundred seventy-nine million, eight hundred fifty-six thousand, five hundred twelve".