28029781056 has 56 divisors (see below), whose sum is σ = 74199922720. Its totient is φ = 9338499072.

The previous prime is 28029781007. The next prime is 28029781057. The reversal of 28029781056 is 65018792082.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a junction number, because it is equal to n+sod(n) for n = 28029780996 and 28029781014.

It is not an unprimeable number, because it can be changed into a prime (28029781057) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 351075 + ... + 423453.

It is an arithmetic number, because the mean of its divisors is an integer number (1324998620).

Almost surely, 2^28029781056 is an apocalyptic number.

It is an amenable number.

28029781056 is an abundant number, since it is smaller than the sum of its proper divisors (46170141664).

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

28029781056 is a wasteful number, since it uses less digits than its factorization.

28029781056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74411 (or 74401 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 48.

The spelling of 28029781056 in words is "twenty-eight billion, twenty-nine million, seven hundred eighty-one thousand, fifty-six".