1320721248 has 384 divisors, whose sum is σ = 4589706240. Its totient is φ = 322560000.

The previous prime is 1320721247. The next prime is 1320721273. The reversal of 1320721248 is 8421270231.

It is a super-2 number, since 2×1320721248² = 3488609229837355008, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320721243) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 13076398 + ... + 13076498.

It is an arithmetic number, because the mean of its divisors is an integer number (11952360).

Almost surely, 2^1320721248 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1320721248, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2294853120).

1320721248 is an abundant number, since it is smaller than the sum of its proper divisors (3268984992).

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

1320721248 is a wasteful number, since it uses less digits than its factorization.

1320721248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222 (or 214 counting only the distinct ones).

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

The square root of 1320721248 is about 36341.7287425901. The cubic root of 1320721248 is about 1097.1610673286.

Adding to 1320721248 its reverse (8421270231), we get a palindrome (9741991479).

The spelling of 1320721248 in words is "one billion, three hundred twenty million, seven hundred twenty-one thousand, two hundred forty-eight".