19988618790 has 64 divisors (see below), whose sum is σ = 55104344064. Its totient is φ = 4545625728.

The previous prime is 19988618779. The next prime is 19988618821. The reversal of 19988618790 is 9781688991.

It is a super-4 number, since 4×19988618790⁴ (a number of 42 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 200214 + ... + 282953.

It is an arithmetic number, because the mean of its divisors is an integer number (861005376).

Almost surely, 2^19988618790 is an apocalyptic number.

19988618790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19988618790 is an abundant number, since it is smaller than the sum of its proper divisors (35115725274).

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

19988618790 is a wasteful number, since it uses less digits than its factorization.

19988618790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 483381.

The product of its (nonzero) digits is 15676416, while the sum is 66.

The spelling of 19988618790 in words is "nineteen billion, nine hundred eighty-eight million, six hundred eighteen thousand, seven hundred ninety".