1224671220 has 144 divisors (see below), whose sum is σ = 3924123840. Its totient is φ = 308302848.

The previous prime is 1224671209. The next prime is 1224671233. The reversal of 1224671220 is 221764221.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1480447 + ... + 1481273.

It is an arithmetic number, because the mean of its divisors is an integer number (27250860).

Almost surely, 2^1224671220 is an apocalyptic number.

1224671220 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 1224671220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1962061920).

1224671220 is an abundant number, since it is smaller than the sum of its proper divisors (2699452620).

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

1224671220 is a wasteful number, since it uses less digits than its factorization.

1224671220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1294 (or 1289 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 1224671220 is about 34995.3028276653. The cubic root of 1224671220 is about 1069.8917466981.

The spelling of 1224671220 in words is "one billion, two hundred twenty-four million, six hundred seventy-one thousand, two hundred twenty".