19890187200 has 672 divisors, whose sum is σ = 79052440320. Its totient is φ = 4835635200.

The previous prime is 19890187193. The next prime is 19890187237. The reversal of 19890187200 is 278109891.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 60091035 + ... + 60091365.

It is an arithmetic number, because the mean of its divisors is an integer number (117637560).

Almost surely, 2^19890187200 is an apocalyptic number.

19890187200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19890187200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39526220160).

19890187200 is an abundant number, since it is smaller than the sum of its proper divisors (59162253120).

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

19890187200 is a wasteful number, since it uses less digits than its factorization.

19890187200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 482 (or 461 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 45.

The spelling of 19890187200 in words is "nineteen billion, eight hundred ninety million, one hundred eighty-seven thousand, two hundred".