28685404 has 24 divisors (see below), whose sum is σ = 56102256. Its totient is φ = 12720000.

The previous prime is 28685401. The next prime is 28685407. The reversal of 28685404 is 40458682.

It is an interprime number because it is at equal distance from previous prime (28685401) and next prime (28685407).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28685401) 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, 6147 + ... + 9754.

It is an arithmetic number, because the mean of its divisors is an integer number (2337594).

Almost surely, 2^28685404 is an apocalyptic number.

It is an amenable number.

28685404 is a deficient number, since it is larger than the sum of its proper divisors (27416852).

28685404 is a wasteful number, since it uses less digits than its factorization.

28685404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15957 (or 15955 counting only the distinct ones).

The product of its (nonzero) digits is 61440, while the sum is 37.

The square root of 28685404 is about 5355.8756520293. The cubic root of 28685404 is about 306.1166769946.

The spelling of 28685404 in words is "twenty-eight million, six hundred eighty-five thousand, four hundred four".