28278180 has 96 divisors (see below), whose sum is σ = 100558080. Its totient is φ = 6462720.

The previous prime is 28278139. The next prime is 28278181. The reversal of 28278180 is 8187282.

It is a super-2 number, since 2×28278180² = 1599310928224800, which contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (28278181) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 40 + ... + 7520.

It is an arithmetic number, because the mean of its divisors is an integer number (1047480).

Almost surely, 2^28278180 is an apocalyptic number.

28278180 is a gapful number since it is divisible by the number (20) 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 28278180, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50279040).

28278180 is an abundant number, since it is smaller than the sum of its proper divisors (72279900).

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

28278180 is a wasteful number, since it uses less digits than its factorization.

28278180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7506 (or 7498 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 36.

The square root of 28278180 is about 5317.7231970083. The cubic root of 28278180 is about 304.6612022273.

The spelling of 28278180 in words is "twenty-eight million, two hundred seventy-eight thousand, one hundred eighty".