11728220 has 24 divisors (see below), whose sum is σ = 28148064. Its totient is φ = 4021056.

The previous prime is 11728217. The next prime is 11728247. The reversal of 11728220 is 2282711.

It is a super-2 number, since 2×11728220² = 275102288736800, which 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, 41747 + ... + 42026.

It is an arithmetic number, because the mean of its divisors is an integer number (1172836).

Almost surely, 2^11728220 is an apocalyptic number.

11728220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11728220 is an abundant number, since it is smaller than the sum of its proper divisors (16419844).

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

11728220 is a wasteful number, since it uses less digits than its factorization.

11728220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83789 (or 83787 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 11728220 is about 3424.6488871124. The cubic root of 11728220 is about 227.2012420996.

The spelling of 11728220 in words is "eleven million, seven hundred twenty-eight thousand, two hundred twenty".