28202220 has 36 divisors (see below), whose sum is σ = 85547280. Its totient is φ = 7520544.

The previous prime is 28202203. The next prime is 28202227. The reversal of 28202220 is 2220282.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 28202193 and 28202202.

It is not an unprimeable number, because it can be changed into a prime (28202227) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 78160 + ... + 78519.

Almost surely, 2^28202220 is an apocalyptic number.

28202220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28202220 is an abundant number, since it is smaller than the sum of its proper divisors (57345060).

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

28202220 is a wasteful number, since it uses less digits than its factorization.

28202220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156694 (or 156689 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 28202220 is about 5310.5762399197. The cubic root of 28202220 is about 304.3881670099.

The spelling of 28202220 in words is "twenty-eight million, two hundred two thousand, two hundred twenty".