28621217144 has 16 divisors (see below), whose sum is σ = 57792842520. Its totient is φ = 13209792480.

The previous prime is 28621217137. The next prime is 28621217159. The reversal of 28621217144 is 44171212682.

It is a junction number, because it is equal to n+sod(n) for n = 28621217098 and 28621217107.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137601902 + ... + 137602109.

Almost surely, 2^28621217144 is an apocalyptic number.

It is an amenable number.

28621217144 is an abundant number, since it is smaller than the sum of its proper divisors (29171625376).

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

28621217144 is a wasteful number, since it uses less digits than its factorization.

28621217144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275204030 (or 275204026 counting only the distinct ones).

The product of its digits is 43008, while the sum is 38.

The spelling of 28621217144 in words is "twenty-eight billion, six hundred twenty-one million, two hundred seventeen thousand, one hundred forty-four".