18720088778 has 8 divisors (see below), whose sum is σ = 28083662400. Its totient is φ = 9358867980.

The previous prime is 18720088757. The next prime is 18720088801. The reversal of 18720088778 is 87788002781.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 568178 + ... + 600221.

It is an arithmetic number, because the mean of its divisors is an integer number (3510457800).

Almost surely, 2^18720088778 is an apocalyptic number.

18720088778 is a deficient number, since it is larger than the sum of its proper divisors (9363573622).

18720088778 is a wasteful number, since it uses less digits than its factorization.

18720088778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1176412.

The product of its (nonzero) digits is 2809856, while the sum is 56.

The spelling of 18720088778 in words is "eighteen billion, seven hundred twenty million, eighty-eight thousand, seven hundred seventy-eight".