12780651 has 32 divisors (see below), whose sum is σ = 19994688. Its totient is φ = 7188480.

The previous prime is 12780637. The next prime is 12780661. The reversal of 12780651 is 15608721.

It is not a de Polignac number, because 12780651 - 2⁹ = 12780139 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12780601) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24271 + ... + 24791.

It is an arithmetic number, because the mean of its divisors is an integer number (624834).

Almost surely, 2^12780651 is an apocalyptic number.

12780651 is a deficient number, since it is larger than the sum of its proper divisors (7214037).

12780651 is a wasteful number, since it uses less digits than its factorization.

12780651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 591.

The product of its (nonzero) digits is 3360, while the sum is 30.

The square root of 12780651 is about 3575.0036363618. The cubic root of 12780651 is about 233.8034912422.

It can be divided in two parts, 12780 and 651, that added together give a palindrome (13431).

The spelling of 12780651 in words is "twelve million, seven hundred eighty thousand, six hundred fifty-one".