123345680 has 20 divisors (see below), whose sum is σ = 286778892. Its totient is φ = 49338240.

The previous prime is 123345653. The next prime is 123345697. The reversal of 123345680 is 86543321.

It can be written as a sum of positive squares in 2 ways, for example, as 30647296 + 92698384 = 5536^2 + 9628^2 .

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

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, 770831 + ... + 770990.

Almost surely, 2^123345680 is an apocalyptic number.

123345680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123345680 is an abundant number, since it is smaller than the sum of its proper divisors (163433212).

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

123345680 is a wasteful number, since it uses less digits than its factorization.

123345680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1541834 (or 1541828 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 123345680 is about 11106.1100300690. The cubic root of 123345680 is about 497.7844370625.

The spelling of 123345680 in words is "one hundred twenty-three million, three hundred forty-five thousand, six hundred eighty".