13644774 has 160 divisors (see below), whose sum is σ = 39029760. Its totient is φ = 3499200.

The previous prime is 13644769. The next prime is 13644781. The reversal of 13644774 is 47744631.

It is a happy number.

13644774 is a `hidden beast` number, since 1 + 3 + 644 + 7 + 7 + 4 = 666.

13644774 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×13644774² = 372359715022152, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 440139 + ... + 440169.

It is an arithmetic number, because the mean of its divisors is an integer number (243936).

Almost surely, 2^13644774 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13644774, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19514880).

13644774 is an abundant number, since it is smaller than the sum of its proper divisors (25384986).

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

13644774 is a wasteful number, since it uses less digits than its factorization.

13644774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88 (or 79 counting only the distinct ones).

The product of its digits is 56448, while the sum is 36.

The square root of 13644774 is about 3693.8833224670. The cubic root of 13644774 is about 238.9582976089.

The spelling of 13644774 in words is "thirteen million, six hundred forty-four thousand, seven hundred seventy-four".