12780577 has 8 divisors (see below), whose sum is σ = 13250600. Its totient is φ = 12317184.

The previous prime is 12780557. The next prime is 12780601. The reversal of 12780577 is 77508721.

It can be written as a sum of positive squares in 4 ways, for example, as 7834401 + 4946176 = 2799^2 + 2224^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12780577 - 2¹⁵ = 12747809 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12780517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2449 + ... + 5617.

It is an arithmetic number, because the mean of its divisors is an integer number (1656325).

Almost surely, 2^12780577 is an apocalyptic number.

It is an amenable number.

12780577 is a deficient number, since it is larger than the sum of its proper divisors (470023).

12780577 is a wasteful number, since it uses less digits than its factorization.

12780577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3315.

The product of its (nonzero) digits is 27440, while the sum is 37.

The square root of 12780577 is about 3574.9932867070. The cubic root of 12780577 is about 233.8030400004.

The spelling of 12780577 in words is "twelve million, seven hundred eighty thousand, five hundred seventy-seven".