18780716 has 12 divisors (see below), whose sum is σ = 34799688. Its totient is φ = 8837952.

The previous prime is 18780667. The next prime is 18780731. The reversal of 18780716 is 61708781.

It is a self number, because there is not a number n which added to its sum of digits gives 18780716.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138026 + ... + 138161.

It is an arithmetic number, because the mean of its divisors is an integer number (2899974).

Almost surely, 2^18780716 is an apocalyptic number.

It is an amenable number.

18780716 is a deficient number, since it is larger than the sum of its proper divisors (16018972).

18780716 is a wasteful number, since it uses less digits than its factorization.

18780716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276208 (or 276206 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 38.

The square root of 18780716 is about 4333.6723457133. The cubic root of 18780716 is about 265.8096325757.

The spelling of 18780716 in words is "eighteen million, seven hundred eighty thousand, seven hundred sixteen".