12765780 has 36 divisors (see below), whose sum is σ = 38723412. Its totient is φ = 3404160.

The previous prime is 12765763. The next prime is 12765787. The reversal of 12765780 is 8756721.

12765780 is a `hidden beast` number, since 12 + 76 + 578 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 8749764 + 4016016 = 2958^2 + 2004^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12765787) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35281 + ... + 35640.

Almost surely, 2^12765780 is an apocalyptic number.

12765780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12765780 is an abundant number, since it is smaller than the sum of its proper divisors (25957632).

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

12765780 is a wasteful number, since it uses less digits than its factorization.

12765780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70936 (or 70931 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 36.

The square root of 12765780 is about 3572.9231729776. The cubic root of 12765780 is about 233.7127749161.

It can be divided in two parts, 1276 and 5780, that added together give a square (7056 = 84²).

The spelling of 12765780 in words is "twelve million, seven hundred sixty-five thousand, seven hundred eighty".