12345680 has 20 divisors (see below), whose sum is σ = 28703892. Its totient is φ = 4938240.

The previous prime is 12345653. The next prime is 12345701. The reversal of 12345680 is 8654321.

It can be written as a sum of positive squares in 2 ways, for example, as 2334784 + 10010896 = 1528^2 + 3164^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a Smith number, since the sum of its digits (29) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77081 + ... + 77240.

Almost surely, 2^12345680 is an apocalyptic number.

12345680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12345680 is an abundant number, since it is smaller than the sum of its proper divisors (16358212).

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

12345680 is a wasteful number, since it uses less digits than its factorization.

12345680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154334 (or 154328 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 12345680 is about 3513.6419851772. The cubic root of 12345680 is about 231.1204309468.

The spelling of 12345680 in words is "twelve million, three hundred forty-five thousand, six hundred eighty".