13776644 has 18 divisors (see below), whose sum is σ = 28045710. Its totient is φ = 5904192.

The previous prime is 13776611. The next prime is 13776649. The reversal of 13776644 is 44667731.

It can be written as a sum of positive squares in only one way, i.e., 13764100 + 12544 = 3710^2 + 112^2 .

It is a junction number, because it is equal to n+sod(n) for n = 13776598 and 13776607.

It is not an unprimeable number, because it can be changed into a prime (13776649) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 34949 + ... + 35340.

It is an arithmetic number, because the mean of its divisors is an integer number (1558095).

Almost surely, 2^13776644 is an apocalyptic number.

13776644 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

13776644 is an abundant number, since it is smaller than the sum of its proper divisors (14269066).

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

13776644 is a wasteful number, since it uses less digits than its factorization.

13776644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70307 (or 70298 counting only the distinct ones).

The product of its digits is 84672, while the sum is 38.

The square root of 13776644 is about 3711.6901810361. The cubic root of 13776644 is about 239.7256355442.

The spelling of 13776644 in words is "thirteen million, seven hundred seventy-six thousand, six hundred forty-four".