28503904 has 48 divisors (see below), whose sum is σ = 65938320. Its totient is φ = 11957760.

The previous prime is 28503901. The next prime is 28503907. The reversal of 28503904 is 40930582.

It is an interprime number because it is at equal distance from previous prime (28503901) and next prime (28503907).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28503901) 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, 1462 + ... + 7690.

It is an arithmetic number, because the mean of its divisors is an integer number (1373715).

Almost surely, 2^28503904 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 28503904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32969160).

28503904 is an abundant number, since it is smaller than the sum of its proper divisors (37434416).

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

28503904 is a wasteful number, since it uses less digits than its factorization.

28503904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6263 (or 6255 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 28503904 is about 5338.9047565957. The cubic root of 28503904 is about 305.4696839367.

The spelling of 28503904 in words is "twenty-eight million, five hundred three thousand, nine hundred four".