1220722720 has 96 divisors (see below), whose sum is σ = 3314908800. Its totient is φ = 416126976.

The previous prime is 1220722703. The next prime is 1220722747. The reversal of 1220722720 is 272270221.

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, 197436 + ... + 203524.

It is an arithmetic number, because the mean of its divisors is an integer number (34530300).

Almost surely, 2^1220722720 is an apocalyptic number.

1220722720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1220722720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1657454400).

1220722720 is an abundant number, since it is smaller than the sum of its proper divisors (2094186080).

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

1220722720 is a wasteful number, since it uses less digits than its factorization.

1220722720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6290 (or 6282 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 25.

The square root of 1220722720 is about 34938.8425681218. The cubic root of 1220722720 is about 1068.7406851667.

Adding to 1220722720 its reverse (272270221), we get a palindrome (1492992941).

The spelling of 1220722720 in words is "one billion, two hundred twenty million, seven hundred twenty-two thousand, seven hundred twenty".