16720388892 has 72 divisors (see below), whose sum is σ = 44654588160. Its totient is φ = 5260580640.

The previous prime is 16720388843. The next prime is 16720388921. The reversal of 16720388892 is 29888302761.

It is a happy number.

16720388892 is a `hidden beast` number, since 167 + 20 + 388 + 89 + 2 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 140263 + ... + 230465.

Almost surely, 2^16720388892 is an apocalyptic number.

16720388892 is a gapful number since it is divisible by the number (12) 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 16720388892, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22327294080).

16720388892 is an abundant number, since it is smaller than the sum of its proper divisors (27934199268).

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

16720388892 is a wasteful number, since it uses less digits than its factorization.

16720388892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90503 (or 90498 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 54.

The spelling of 16720388892 in words is "sixteen billion, seven hundred twenty million, three hundred eighty-eight thousand, eight hundred ninety-two".