16390787868 has 144 divisors (see below), whose sum is σ = 51047732736. Its totient is φ = 4318254720.

The previous prime is 16390787867. The next prime is 16390787887. The reversal of 16390787868 is 86878709361.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16390787867) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 4004503 + ... + 4008593.

It is an arithmetic number, because the mean of its divisors is an integer number (354498144).

Almost surely, 2^16390787868 is an apocalyptic number.

16390787868 is a gapful number since it is divisible by the number (18) 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 16390787868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25523866368).

16390787868 is an abundant number, since it is smaller than the sum of its proper divisors (34656944868).

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

16390787868 is a wasteful number, since it uses less digits than its factorization.

16390787868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5344 (or 5339 counting only the distinct ones).

The product of its (nonzero) digits is 24385536, while the sum is 63.

The spelling of 16390787868 in words is "sixteen billion, three hundred ninety million, seven hundred eighty-seven thousand, eight hundred sixty-eight".