28515004 has 24 divisors (see below), whose sum is σ = 58998240. Its totient is φ = 11798976.

The previous prime is 28514957. The next prime is 28515013. The reversal of 28515004 is 40051582.

It is a self number, because there is not a number n which added to its sum of digits gives 28515004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16747 + ... + 18370.

It is an arithmetic number, because the mean of its divisors is an integer number (2458260).

Almost surely, 2^28515004 is an apocalyptic number.

It is an amenable number.

28515004 is an abundant number, since it is smaller than the sum of its proper divisors (30483236).

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

28515004 is a wasteful number, since it uses less digits than its factorization.

28515004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35157 (or 35155 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 25.

The square root of 28515004 is about 5339.9441944650. The cubic root of 28515004 is about 305.5093308268.

Adding to 28515004 its reverse (40051582), we get a palindrome (68566586).

The spelling of 28515004 in words is "twenty-eight million, five hundred fifteen thousand, four".