220728612 has 48 divisors (see below), whose sum is σ = 587284992. Its totient is φ = 63920640.

The previous prime is 220728601. The next prime is 220728661. The reversal of 220728612 is 216827022.

It is a super-2 number, since 2×220728612² = 97442240310893088, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 220728612.

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, 38964 + ... + 44267.

It is an arithmetic number, because the mean of its divisors is an integer number (12235104).

Almost surely, 2^220728612 is an apocalyptic number.

It is an amenable number.

220728612 is an abundant number, since it is smaller than the sum of its proper divisors (366556380).

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

220728612 is a wasteful number, since it uses less digits than its factorization.

220728612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83268 (or 83266 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 220728612 is about 14856.9381771615. The cubic root of 220728612 is about 604.3467776055.

The spelling of 220728612 in words is "two hundred twenty million, seven hundred twenty-eight thousand, six hundred twelve".