13220776 has 8 divisors (see below), whose sum is σ = 24788970. Its totient is φ = 6610384.

The previous prime is 13220773. The next prime is 13220843. The reversal of 13220776 is 67702231.

It can be written as a sum of positive squares in only one way, i.e., 13147876 + 72900 = 3626^2 + 270^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (13220773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 826291 + ... + 826306.

Almost surely, 2^13220776 is an apocalyptic number.

It is an amenable number.

13220776 is a deficient number, since it is larger than the sum of its proper divisors (11568194).

13220776 is a wasteful number, since it uses less digits than its factorization.

13220776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1652603 (or 1652599 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 28.

The square root of 13220776 is about 3636.0385036465. The cubic root of 13220776 is about 236.4570764504.

The spelling of 13220776 in words is "thirteen million, two hundred twenty thousand, seven hundred seventy-six".