28618004 has 12 divisors (see below), whose sum is σ = 53027604. Its totient is φ = 13467264.

The previous prime is 28617997. The next prime is 28618013. The reversal of 28618004 is 40081682.

It can be written as a sum of positive squares in 2 ways, for example, as 22848400 + 5769604 = 4780^2 + 2402^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 210359 + ... + 210494.

It is an arithmetic number, because the mean of its divisors is an integer number (4418967).

Almost surely, 2^28618004 is an apocalyptic number.

It is an amenable number.

28618004 is a deficient number, since it is larger than the sum of its proper divisors (24409600).

28618004 is a wasteful number, since it uses less digits than its factorization.

28618004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420874 (or 420872 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 29.

The square root of 28618004 is about 5349.5797965822. The cubic root of 28618004 is about 305.8767356347.

Adding to 28618004 its reverse (40081682), we get a palindrome (68699686).

The spelling of 28618004 in words is "twenty-eight million, six hundred eighteen thousand, four".