28735434 has 96 divisors (see below), whose sum is σ = 78309504. Its totient is φ = 7413120.

The previous prime is 28735403. The next prime is 28735463. The reversal of 28735434 is 43453782.

It is a happy 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, 86649 + ... + 86979.

It is an arithmetic number, because the mean of its divisors is an integer number (815724).

Almost surely, 2^28735434 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28735434, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39154752).

28735434 is an abundant number, since it is smaller than the sum of its proper divisors (49574070).

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

28735434 is a wasteful number, since it uses less digits than its factorization.

28735434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 412 (or 409 counting only the distinct ones).

The product of its digits is 80640, while the sum is 36.

The square root of 28735434 is about 5360.5441887928. The cubic root of 28735434 is about 306.2945389061.

It can be divided in two parts, 287 and 35434, that added together give a square (35721 = 189²).

The spelling of 28735434 in words is "twenty-eight million, seven hundred thirty-five thousand, four hundred thirty-four".