28480423220 has 24 divisors (see below), whose sum is σ = 60210297000. Its totient is φ = 11315710592.

The previous prime is 28480423157. The next prime is 28480423243. The reversal of 28480423220 is 2232408482.

It can be written as a sum of positive squares in 4 ways, for example, as 63904036 + 28416519184 = 7994^2 + 168572^2 .

It is a super-2 number, since 2×28480423220² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4775615 + ... + 4781574.

It is an arithmetic number, because the mean of its divisors is an integer number (2508762375).

Almost surely, 2^28480423220 is an apocalyptic number.

28480423220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28480423220 is an abundant number, since it is smaller than the sum of its proper divisors (31729873780).

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

28480423220 is a wasteful number, since it uses less digits than its factorization.

28480423220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9557347 (or 9557345 counting only the distinct ones).

The product of its (nonzero) digits is 49152, while the sum is 35.

The spelling of 28480423220 in words is "twenty-eight billion, four hundred eighty million, four hundred twenty-three thousand, two hundred twenty".