1328243772 has 12 divisors (see below), whose sum is σ = 3099235496. Its totient is φ = 442747920.

The previous prime is 1328243753. The next prime is 1328243783. The reversal of 1328243772 is 2773428231.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 1328243772.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55343479 + ... + 55343502.

Almost surely, 2^1328243772 is an apocalyptic number.

1328243772 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1328243772 is an abundant number, since it is smaller than the sum of its proper divisors (1770991724).

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

1328243772 is a wasteful number, since it uses less digits than its factorization.

1328243772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110686988 (or 110686986 counting only the distinct ones).

The product of its digits is 112896, while the sum is 39.

The square root of 1328243772 is about 36445.0788447494. The cubic root of 1328243772 is about 1099.2401838239.

The spelling of 1328243772 in words is "one billion, three hundred twenty-eight million, two hundred forty-three thousand, seven hundred seventy-two".