28218450 has 96 divisors (see below), whose sum is σ = 78120000. Its totient is φ = 6693120.

The previous prime is 28218433. The next prime is 28218469. The reversal of 28218450 is 5481282.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 56301 + ... + 56799.

It is an arithmetic number, because the mean of its divisors is an integer number (813750).

Almost surely, 2^28218450 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28218450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39060000).

28218450 is an abundant number, since it is smaller than the sum of its proper divisors (49901550).

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

28218450 is a wasteful number, since it uses less digits than its factorization.

28218450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 556 (or 551 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 30.

The square root of 28218450 is about 5312.1041028956. The cubic root of 28218450 is about 304.4465462507.

The spelling of 28218450 in words is "twenty-eight million, two hundred eighteen thousand, four hundred fifty".