12777505 has 16 divisors (see below), whose sum is σ = 16828560. Its totient is φ = 9255168.

The previous prime is 12777497. The next prime is 12777509. The reversal of 12777505 is 50577721.

12777505 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 937024 + 11840481 = 968^2 + 3441^2 .

It is not a de Polignac number, because 12777505 - 2³ = 12777497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12777509) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1591 + ... + 5299.

It is an arithmetic number, because the mean of its divisors is an integer number (1051785).

Almost surely, 2^12777505 is an apocalyptic number.

It is an amenable number.

12777505 is a deficient number, since it is larger than the sum of its proper divisors (4051055).

12777505 is a wasteful number, since it uses less digits than its factorization.

12777505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3780.

The product of its (nonzero) digits is 17150, while the sum is 34.

The square root of 12777505 is about 3574.5636097292. The cubic root of 12777505 is about 233.7843058307.

The spelling of 12777505 in words is "twelve million, seven hundred seventy-seven thousand, five hundred five".