28254403785880 has 64 divisors (see below), whose sum is σ = 65785243305600. Its totient is φ = 10908613793280.

The previous prime is 28254403785869. The next prime is 28254403785961. The reversal of 28254403785880 is 8858730445282.

It is a happy number.

It is a super-3 number, since 3×28254403785880³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Smith number, since the sum of its digits (64) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 138592 + ... + 7518511.

It is an arithmetic number, because the mean of its divisors is an integer number (1027894426650).

Almost surely, 2^{28254403785880} is an apocalyptic number.

28254403785880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28254403785880 is an abundant number, since it is smaller than the sum of its proper divisors (37530839519720).

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

28254403785880 is a wasteful number, since it uses less digits than its factorization.

28254403785880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7660324 (or 7660320 counting only the distinct ones).

The product of its (nonzero) digits is 137625600, while the sum is 64.

The spelling of 28254403785880 in words is "twenty-eight trillion, two hundred fifty-four billion, four hundred three million, seven hundred eighty-five thousand, eight hundred eighty".