12611780 has 12 divisors (see below), whose sum is σ = 26484780. Its totient is φ = 5044704.

The previous prime is 12611777. The next prime is 12611789. The reversal of 12611780 is 8711621.

It can be written as a sum of positive squares in 2 ways, for example, as 1308736 + 11303044 = 1144^2 + 3362^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12611789) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 315275 + ... + 315314.

It is an arithmetic number, because the mean of its divisors is an integer number (2207065).

Almost surely, 2^12611780 is an apocalyptic number.

12611780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12611780 is an abundant number, since it is smaller than the sum of its proper divisors (13873000).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12611780 is a wasteful number, since it uses less digits than its factorization.

12611780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 630598 (or 630596 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 26.

The square root of 12611780 is about 3551.3068017281. The cubic root of 12611780 is about 232.7691721991.

The spelling of 12611780 in words is "twelve million, six hundred eleven thousand, seven hundred eighty".