220515728 has 40 divisors (see below), whose sum is σ = 441721728. Its totient is φ = 106581632.

The previous prime is 220515689. The next prime is 220515751. The reversal of 220515728 is 827515022.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 220515694 and 220515703.

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, 60650 + ... + 64182.

Almost surely, 2^220515728 is an apocalyptic number.

It is an amenable number.

220515728 is an abundant number, since it is smaller than the sum of its proper divisors (221206000).

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

220515728 is a wasteful number, since it uses less digits than its factorization.

220515728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3671 (or 3665 counting only the distinct ones).

The product of its (nonzero) digits is 11200, while the sum is 32.

The square root of 220515728 is about 14849.7719847814. The cubic root of 220515728 is about 604.1524256038.

The spelling of 220515728 in words is "two hundred twenty million, five hundred fifteen thousand, seven hundred twenty-eight".