28708504 has 32 divisors (see below), whose sum is σ = 59169600. Its totient is φ = 12949920.

The previous prime is 28708501. The next prime is 28708513. The reversal of 28708504 is 40580782.

28708504 = 1332² + 1333² + ... + 1347².

It is a self number, because there is not a number n which added to its sum of digits gives 28708504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28708501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11059 + ... + 13405.

It is an arithmetic number, because the mean of its divisors is an integer number (1849050).

Almost surely, 2^28708504 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 28708504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29584800).

28708504 is an abundant number, since it is smaller than the sum of its proper divisors (30461096).

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

28708504 is a wasteful number, since it uses less digits than its factorization.

28708504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2503 (or 2499 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 34.

The square root of 28708504 is about 5358.0317281629. The cubic root of 28708504 is about 306.1988256017.

The spelling of 28708504 in words is "twenty-eight million, seven hundred eight thousand, five hundred four".