28434438 has 48 divisors (see below), whose sum is σ = 66779856. Its totient is φ = 8709120.

The previous prime is 28434433. The next prime is 28434457. The reversal of 28434438 is 83443482.

28434438 is a `hidden beast` number, since 284 + 344 + 38 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28434433) 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, 12078 + ... + 14238.

It is an arithmetic number, because the mean of its divisors is an integer number (1391247).

Almost surely, 2^28434438 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28434438, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33389928).

28434438 is an abundant number, since it is smaller than the sum of its proper divisors (38345418).

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

28434438 is a wasteful number, since it uses less digits than its factorization.

28434438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2229 (or 2226 counting only the distinct ones).

The product of its digits is 73728, while the sum is 36.

The square root of 28434438 is about 5332.3951466485. The cubic root of 28434438 is about 305.2213317759.

The spelling of 28434438 in words is "twenty-eight million, four hundred thirty-four thousand, four hundred thirty-eight".