13128780 has 48 divisors (see below), whose sum is σ = 42013440. Its totient is φ = 3000768.

The previous prime is 13128769. The next prime is 13128781. The reversal of 13128780 is 8782131.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (13128781) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15210 + ... + 16049.

It is an arithmetic number, because the mean of its divisors is an integer number (875280).

Almost surely, 2^13128780 is an apocalyptic number.

13128780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13128780 is an abundant number, since it is smaller than the sum of its proper divisors (28884660).

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

13128780 is a wasteful number, since it uses less digits than its factorization.

13128780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31278 (or 31276 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 30.

The square root of 13128780 is about 3623.3658385540. The cubic root of 13128780 is about 235.9073417734.

The spelling of 13128780 in words is "thirteen million, one hundred twenty-eight thousand, seven hundred eighty".