28018396 has 36 divisors (see below), whose sum is σ = 57452808. Its totient is φ = 11920608.

The previous prime is 28018387. The next prime is 28018423. The reversal of 28018396 is 69381082.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31510 + ... + 32386.

Almost surely, 2^28018396 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28018396, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28726404).

28018396 is an abundant number, since it is smaller than the sum of its proper divisors (29434412).

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

28018396 is a wasteful number, since it uses less digits than its factorization.

28018396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1058 (or 1049 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 28018396 is about 5293.2405953253. The cubic root of 28018396 is about 303.7253839276.

The spelling of 28018396 in words is "twenty-eight million, eighteen thousand, three hundred ninety-six".