21728482560 has 108 divisors (see below), whose sum is σ = 75178326132. Its totient is φ = 5794258944.

The previous prime is 21728482547. The next prime is 21728482603. The reversal of 21728482560 is 6528482712.

21728482560 is a `hidden beast` number, since 2 + 1 + 7 + 2 + 8 + 4 + 82 + 560 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 16970793984 + 4757688576 = 130272^2 + 68976^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 931557 + ... + 954596.

Almost surely, 2^21728482560 is an apocalyptic number.

21728482560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21728482560 is an abundant number, since it is smaller than the sum of its proper divisors (53449843572).

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

21728482560 is a wasteful number, since it uses less digits than its factorization.

21728482560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1886180 (or 1886163 counting only the distinct ones).

The product of its (nonzero) digits is 430080, while the sum is 45.

The spelling of 21728482560 in words is "twenty-one billion, seven hundred twenty-eight million, four hundred eighty-two thousand, five hundred sixty".