28439334 has 144 divisors (see below), whose sum is σ = 82757376. Its totient is φ = 6854400.

The previous prime is 28439329. The next prime is 28439353. The reversal of 28439334 is 43393482.

It is a happy number.

It is a super-3 number, since 3×28439334³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 400519 + ... + 400589.

It is an arithmetic number, because the mean of its divisors is an integer number (574704).

Almost surely, 2^28439334 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28439334, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41378688).

28439334 is an abundant number, since it is smaller than the sum of its proper divisors (54318042).

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

28439334 is a wasteful number, since it uses less digits than its factorization.

28439334 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131 (or 111 counting only the distinct ones).

The product of its digits is 62208, while the sum is 36.

The square root of 28439334 is about 5332.8542076453. The cubic root of 28439334 is about 305.2388490072.

The spelling of 28439334 in words is "twenty-eight million, four hundred thirty-nine thousand, three hundred thirty-four".