28454004 has 60 divisors (see below), whose sum is σ = 75833604. Its totient is φ = 9300096.

The previous prime is 28453993. The next prime is 28454009. The reversal of 28454004 is 40045482.

It can be written as a sum of positive squares in 2 ways, for example, as 14837904 + 13616100 = 3852^2 + 3690^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28454009) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 16344 + ... + 18000.

Almost surely, 2^28454004 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 28454004, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37916802).

28454004 is an abundant number, since it is smaller than the sum of its proper divisors (47379600).

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

28454004 is a wasteful number, since it uses less digits than its factorization.

28454004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1726 (or 1715 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 27.

The square root of 28454004 is about 5334.2294663803. The cubic root of 28454004 is about 305.2913242655.

Adding to 28454004 its reverse (40045482), we get a palindrome (68499486).

The spelling of 28454004 in words is "twenty-eight million, four hundred fifty-four thousand, four".