13605780 has 48 divisors (see below), whose sum is σ = 40340160. Its totient is φ = 3414528.

The previous prime is 13605769. The next prime is 13605793. The reversal of 13605780 is 8750631.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5650 + ... + 7689.

It is an arithmetic number, because the mean of its divisors is an integer number (840420).

Almost surely, 2^13605780 is an apocalyptic number.

13605780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13605780 is an abundant number, since it is smaller than the sum of its proper divisors (26734380).

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

13605780 is a wasteful number, since it uses less digits than its factorization.

13605780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13368 (or 13366 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 13605780 is about 3688.6013609497. The cubic root of 13605780 is about 238.7304489532.

It can be divided in two parts, 1360 and 5780, that added together give a triangular number (7140 = T₁₁₉).

The spelling of 13605780 in words is "thirteen million, six hundred five thousand, seven hundred eighty".