18728091652 has 24 divisors (see below), whose sum is σ = 33357725856. Its totient is φ = 9198106368.

The previous prime is 18728091637. The next prime is 18728091677. The reversal of 18728091652 is 25619082781.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 18728091596 and 18728091605.

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, 4378 + ... + 193585.

It is an arithmetic number, because the mean of its divisors is an integer number (1389905244).

Almost surely, 2^18728091652 is an apocalyptic number.

It is an amenable number.

18728091652 is a deficient number, since it is larger than the sum of its proper divisors (14629634204).

18728091652 is a wasteful number, since it uses less digits than its factorization.

18728091652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198387 (or 198385 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 49.

The spelling of 18728091652 in words is "eighteen billion, seven hundred twenty-eight million, ninety-one thousand, six hundred fifty-two".