16842780 has 72 divisors (see below), whose sum is σ = 51538032. Its totient is φ = 4452096.

The previous prime is 16842757. The next prime is 16842781. The reversal of 16842780 is 8724861.

It is a super-3 number, since 3×16842780³ (a number of 23 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16842781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24319 + ... + 25001.

It is an arithmetic number, because the mean of its divisors is an integer number (715806).

Almost surely, 2^16842780 is an apocalyptic number.

16842780 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 16842780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25769016).

16842780 is an abundant number, since it is smaller than the sum of its proper divisors (34695252).

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

16842780 is a wasteful number, since it uses less digits than its factorization.

16842780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 835 (or 830 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 16842780 is about 4103.9956140327. The cubic root of 16842780 is about 256.3330422906. Note that the first 3 decimals are identical.

Adding to 16842780 its sum of digits (36), we get a square (16842816 = 4104²).

The spelling of 16842780 in words is "sixteen million, eight hundred forty-two thousand, seven hundred eighty".