28401773888 has 14 divisors (see below), whose sum is σ = 56359770186. Its totient is φ = 14200886912.

The previous prime is 28401773887. The next prime is 28401773927. The reversal of 28401773888 is 88837710482.

It can be written as a sum of positive squares in only one way, i.e., 28226688064 + 175085824 = 168008^2 + 13232^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28401773887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 221888795 + ... + 221888922.

Almost surely, 2^28401773888 is an apocalyptic number.

It is an amenable number.

28401773888 is a deficient number, since it is larger than the sum of its proper divisors (27957996298).

28401773888 is an equidigital number, since it uses as much as digits as its factorization.

28401773888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443777729 (or 443777719 counting only the distinct ones).

The product of its (nonzero) digits is 4816896, while the sum is 56.

The spelling of 28401773888 in words is "twenty-eight billion, four hundred one million, seven hundred seventy-three thousand, eight hundred eighty-eight".