28026504 has 72 divisors (see below), whose sum is σ = 83458830. Its totient is φ = 8490240.

The previous prime is 28026503. The next prime is 28026517. The reversal of 28026504 is 40562082.

28026504 is a `hidden beast` number, since 2 + 8 + 0 + 2 + 650 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 18404100 + 9622404 = 4290^2 + 3102^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is not an unprimeable number, because it can be changed into a prime (28026503) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 7104 + ... + 10320.

Almost surely, 2^28026504 is an apocalyptic number.

28026504 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28026504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41729415).

28026504 is an abundant number, since it is smaller than the sum of its proper divisors (55432326).

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

28026504 is a wasteful number, since it uses less digits than its factorization.

28026504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3251 (or 3233 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 28026504 is about 5294.0064223610. The cubic root of 28026504 is about 303.7546785846.

Adding to 28026504 its reverse (40562082), we get a palindrome (68588586).

The spelling of 28026504 in words is "twenty-eight million, twenty-six thousand, five hundred four".