12685720 has 32 divisors (see below), whose sum is σ = 28894320. Its totient is φ = 5011840.

The previous prime is 12685681. The next prime is 12685733. The reversal of 12685720 is 2758621.

12685720 = T₃₀₅ + T₃₀₆ + ... + T₄₇₀.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1410 + ... + 5230.

Almost surely, 2^12685720 is an apocalyptic number.

12685720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12685720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14447160).

12685720 is an abundant number, since it is smaller than the sum of its proper divisors (16208600).

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

12685720 is a wasteful number, since it uses less digits than its factorization.

12685720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3915 (or 3911 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 12685720 is about 3561.7018404128. The cubic root of 12685720 is about 233.2231770285.

The spelling of 12685720 in words is "twelve million, six hundred eighty-five thousand, seven hundred twenty".