1328780880 has 120 divisors (see below), whose sum is σ = 5100006912. Its totient is φ = 303720192.

The previous prime is 1328780839. The next prime is 1328780881. The reversal of 1328780880 is 880878231.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (120).

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1328780881) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 126784 + ... + 136863.

Almost surely, 2^1328780880 is an apocalyptic number.

1328780880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1328780880 is an abundant number, since it is smaller than the sum of its proper divisors (3771226032).

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

1328780880 is a wasteful number, since it uses less digits than its factorization.

1328780880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263673 (or 263664 counting only the distinct ones).

The product of its (nonzero) digits is 172032, while the sum is 45.

The square root of 1328780880 is about 36452.4468314543. The cubic root of 1328780880 is about 1099.3883321143.

The spelling of 1328780880 in words is "one billion, three hundred twenty-eight million, seven hundred eighty thousand, eight hundred eighty".