13283720 has 32 divisors (see below), whose sum is σ = 30012120. Its totient is φ = 5291520.

The previous prime is 13283707. The next prime is 13283723. The reversal of 13283720 is 2738231.

It can be written as a sum of positive squares in 4 ways, for example, as 7300804 + 5982916 = 2702^2 + 2446^2 .

It is a Smith number, since the sum of its digits (26) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 13283720.

It is not an unprimeable number, because it can be changed into a prime (13283723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11990 + ... + 13050.

Almost surely, 2^13283720 is an apocalyptic number.

13283720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13283720 is an abundant number, since it is smaller than the sum of its proper divisors (16728400).

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

13283720 is a wasteful number, since it uses less digits than its factorization.

13283720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1385 (or 1381 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 13283720 is about 3644.6837997280. The cubic root of 13283720 is about 236.8317391868.

The spelling of 13283720 in words is "thirteen million, two hundred eighty-three thousand, seven hundred twenty".