28404468 has 72 divisors (see below), whose sum is σ = 76396320. Its totient is φ = 8873280.

The previous prime is 28404457. The next prime is 28404469. The reversal of 28404468 is 86440482.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28404469) 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, 89446 + ... + 89762.

It is an arithmetic number, because the mean of its divisors is an integer number (1061060).

Almost surely, 2^28404468 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 28404468, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38198160).

28404468 is an abundant number, since it is smaller than the sum of its proper divisors (47991852).

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

28404468 is a wasteful number, since it uses less digits than its factorization.

28404468 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 477 (or 472 counting only the distinct ones).

The product of its (nonzero) digits is 49152, while the sum is 36.

The square root of 28404468 is about 5329.5842239334. The cubic root of 28404468 is about 305.1140592844.

It can be divided in two parts, 28 and 404468, that added together give a square (404496 = 636²).

The spelling of 28404468 in words is "twenty-eight million, four hundred four thousand, four hundred sixty-eight".