1220727216 has 20 divisors (see below), whose sum is σ = 3153545432. Its totient is φ = 406909056.

The previous prime is 1220727187. The next prime is 1220727223. The reversal of 1220727216 is 6127270221.

It is a super-2 number, since 2×1220727216² = 2980349871766221312, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12715861 + ... + 12715956.

Almost surely, 2^1220727216 is an apocalyptic number.

1220727216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1220727216 is an abundant number, since it is smaller than the sum of its proper divisors (1932818216).

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

1220727216 is a wasteful number, since it uses less digits than its factorization.

1220727216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25431828 (or 25431822 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 30.

The square root of 1220727216 is about 34938.9069090606. The cubic root of 1220727216 is about 1068.7419972452.

Adding to 1220727216 its reverse (6127270221), we get a palindrome (7347997437).

The spelling of 1220727216 in words is "one billion, two hundred twenty million, seven hundred twenty-seven thousand, two hundred sixteen".