28212180 has 72 divisors (see below), whose sum is σ = 83965728. Its totient is φ = 7076352.

The previous prime is 28212179. The next prime is 28212187. The reversal of 28212180 is 8121282.

It is a self number, because there is not a number n which added to its sum of digits gives 28212180.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28212187) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16527 + ... + 18153.

Almost surely, 2^28212180 is an apocalyptic number.

28212180 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 28212180, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41982864).

28212180 is an abundant number, since it is smaller than the sum of its proper divisors (55753548).

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

28212180 is a wasteful number, since it uses less digits than its factorization.

28212180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1673 (or 1654 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 24.

The square root of 28212180 is about 5311.5139084822. The cubic root of 28212180 is about 304.4239957416.

The spelling of 28212180 in words is "twenty-eight million, two hundred twelve thousand, one hundred eighty".