16278220 has 24 divisors (see below), whose sum is σ = 39068064. Its totient is φ = 5581056.

The previous prime is 16278211. The next prime is 16278233. The reversal of 16278220 is 2287261.

16278220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57997 + ... + 58276.

It is an arithmetic number, because the mean of its divisors is an integer number (1627836).

Almost surely, 2^16278220 is an apocalyptic number.

16278220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16278220 is an abundant number, since it is smaller than the sum of its proper divisors (22789844).

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

16278220 is a wasteful number, since it uses less digits than its factorization.

16278220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116289 (or 116287 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 16278220 is about 4034.6276160260. The cubic root of 16278220 is about 253.4363885119.

The spelling of 16278220 in words is "sixteen million, two hundred seventy-eight thousand, two hundred twenty".