28081800144 has 80 divisors (see below), whose sum is σ = 83384692800. Its totient is φ = 9037816704.

The previous prime is 28081800137. The next prime is 28081800157. The reversal of 28081800144 is 44100818082.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 28081800099 and 28081800108.

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, 1108234 + ... + 1133289.

It is an arithmetic number, because the mean of its divisors is an integer number (1042308660).

Almost surely, 2^28081800144 is an apocalyptic number.

28081800144 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

28081800144 is an abundant number, since it is smaller than the sum of its proper divisors (55302892656).

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

28081800144 is a wasteful number, since it uses less digits than its factorization.

28081800144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2241569 (or 2241557 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 36.

The spelling of 28081800144 in words is "twenty-eight billion, eighty-one million, eight hundred thousand, one hundred forty-four".