1320291280 has 240 divisors, whose sum is σ = 3962264256. Its totient is φ = 404490240.

The previous prime is 1320291277. The next prime is 1320291283. The reversal of 1320291280 is 821920231.

It is an interprime number because it is at equal distance from previous prime (1320291277) and next prime (1320291283).

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320291283) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2888812 + ... + 2889268.

Almost surely, 2^1320291280 is an apocalyptic number.

1320291280 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 1320291280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1981132128).

1320291280 is an abundant number, since it is smaller than the sum of its proper divisors (2641972976).

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

1320291280 is a wasteful number, since it uses less digits than its factorization.

1320291280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 562 (or 549 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 1320291280 is about 36335.8126371215. The cubic root of 1320291280 is about 1097.0419921508.

The spelling of 1320291280 in words is "one billion, three hundred twenty million, two hundred ninety-one thousand, two hundred eighty".