28913436 has 60 divisors (see below), whose sum is σ = 76108032. Its totient is φ = 9571392.

The previous prime is 28913419. The next prime is 28913441. The reversal of 28913436 is 63431982.

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

It is a self number, because there is not a number n which added to its sum of digits gives 28913436.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 75301 + ... + 75683.

Almost surely, 2^28913436 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 28913436, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38054016).

28913436 is an abundant number, since it is smaller than the sum of its proper divisors (47194596).

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

28913436 is a wasteful number, since it uses less digits than its factorization.

28913436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 632 (or 621 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 28913436 is about 5377.1215347991. The cubic root of 28913436 is about 306.9256859104.

The spelling of 28913436 in words is "twenty-eight million, nine hundred thirteen thousand, four hundred thirty-six".