28011773568 has 128 divisors (see below), whose sum is σ = 78724008000. Its totient is φ = 8800468992.

The previous prime is 28011773567. The next prime is 28011773617. The reversal of 28011773568 is 86537711082.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (128).

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

It is not an unprimeable number, because it can be changed into a prime (28011773563) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1427568 + ... + 1447056.

Almost surely, 2^28011773568 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 28011773568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39362004000).

28011773568 is an abundant number, since it is smaller than the sum of its proper divisors (50712234432).

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

28011773568 is a wasteful number, since it uses less digits than its factorization.

28011773568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19722 (or 19710 counting only the distinct ones).

The product of its (nonzero) digits is 564480, while the sum is 48.

The spelling of 28011773568 in words is "twenty-eight billion, eleven million, seven hundred seventy-three thousand, five hundred sixty-eight".