28318004 has 48 divisors (see below), whose sum is σ = 60135936. Its totient is φ = 11491200.

The previous prime is 28317997. The next prime is 28318009. The reversal of 28318004 is 40081382.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28318009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16934 + ... + 18530.

It is an arithmetic number, because the mean of its divisors is an integer number (1252832).

Almost surely, 2^28318004 is an apocalyptic number.

It is an amenable number.

28318004 is an abundant number, since it is smaller than the sum of its proper divisors (31817932).

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

28318004 is a wasteful number, since it uses less digits than its factorization.

28318004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1656 (or 1654 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 28318004 is about 5321.4663392715. The cubic root of 28318004 is about 304.8041526888.

Adding to 28318004 its reverse (40081382), we get a palindrome (68399386).

The spelling of 28318004 in words is "twenty-eight million, three hundred eighteen thousand, four".