28421604 has 30 divisors (see below), whose sum is σ = 74300534. Its totient is φ = 9473760.

The previous prime is 28421599. The next prime is 28421611. The reversal of 28421604 is 40612482.

It can be written as a sum of positive squares in only one way, i.e., 22071204 + 6350400 = 4698^2 + 2520^2 .

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 43537 + ... + 44184.

Almost surely, 2^28421604 is an apocalyptic number.

It is an amenable number.

28421604 is an abundant number, since it is smaller than the sum of its proper divisors (45878930).

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

28421604 is a wasteful number, since it uses less digits than its factorization.

28421604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87737 (or 87726 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 28421604 is about 5331.1916116381. The cubic root of 28421604 is about 305.1754038994.

The spelling of 28421604 in words is "twenty-eight million, four hundred twenty-one thousand, six hundred four".