1329268220 has 96 divisors (see below), whose sum is σ = 3335700480. Its totient is φ = 435352320.

The previous prime is 1329268217. The next prime is 1329268247. The reversal of 1329268220 is 228629231.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 340922 + ... + 344798.

It is an arithmetic number, because the mean of its divisors is an integer number (34746880).

Almost surely, 2^1329268220 is an apocalyptic number.

1329268220 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 1329268220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1667850240).

1329268220 is an abundant number, since it is smaller than the sum of its proper divisors (2006432260).

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

1329268220 is a wasteful number, since it uses less digits than its factorization.

1329268220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4003 (or 4001 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 1329268220 is about 36459.1308179446. The cubic root of 1329268220 is about 1099.5227185611.

The spelling of 1329268220 in words is "one billion, three hundred twenty-nine million, two hundred sixty-eight thousand, two hundred twenty".