18728117358 has 32 divisors (see below), whose sum is σ = 39709501440. Its totient is φ = 5878046880.

The previous prime is 18728117341. The next prime is 18728117381. The reversal of 18728117358 is 85371182781.

It is a happy number.

It is a super-3 number, since 3×18728117358³ (a number of 32 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18728117358.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1353778 + ... + 1367541.

It is an arithmetic number, because the mean of its divisors is an integer number (1240921920).

Almost surely, 2^18728117358 is an apocalyptic number.

18728117358 is an abundant number, since it is smaller than the sum of its proper divisors (20981384082).

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

18728117358 is a wasteful number, since it uses less digits than its factorization.

18728117358 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2721392.

The product of its digits is 752640, while the sum is 51.

The spelling of 18728117358 in words is "eighteen billion, seven hundred twenty-eight million, one hundred seventeen thousand, three hundred fifty-eight".