28038708 has 72 divisors (see below), whose sum is σ = 74299680. Its totient is φ = 8904000.

The previous prime is 28038701. The next prime is 28038713. The reversal of 28038708 is 80783082.

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 (28038701) 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, 111583 + ... + 111833.

It is an arithmetic number, because the mean of its divisors is an integer number (1031940).

Almost surely, 2^28038708 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 28038708, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37149840).

28038708 is an abundant number, since it is smaller than the sum of its proper divisors (46260972).

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

28038708 is a wasteful number, since it uses less digits than its factorization.

28038708 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397 (or 392 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 28038708 is about 5295.1589211279. The cubic root of 28038708 is about 303.7987616683.

It can be divided in two parts, 2803 and 8708, that added together give a palindrome (11511).

The spelling of 28038708 in words is "twenty-eight million, thirty-eight thousand, seven hundred eight".