12722816 has 16 divisors (see below), whose sum is σ = 25346490. Its totient is φ = 6361344.

The previous prime is 12722791. The next prime is 12722849. The reversal of 12722816 is 61822721.

It can be written as a sum of positive squares in only one way, i.e., 11022400 + 1700416 = 3320^2 + 1304^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49571 + ... + 49826.

Almost surely, 2^12722816 is an apocalyptic number.

12722816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

12722816 is a deficient number, since it is larger than the sum of its proper divisors (12623674).

12722816 is an frugal number, since it uses more digits than its factorization.

12722816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99411 (or 99399 counting only the distinct ones).

The product of its digits is 2688, while the sum is 29.

The square root of 12722816 is about 3566.9056617746. The cubic root of 12722816 is about 233.4502887600.

The spelling of 12722816 in words is "twelve million, seven hundred twenty-two thousand, eight hundred sixteen".