28805478 has 16 divisors (see below), whose sum is σ = 62042736. Its totient is φ = 8863200.

The previous prime is 28805471. The next prime is 28805489. The reversal of 28805478 is 87450882.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28805471) 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, 184573 + ... + 184728.

It is an arithmetic number, because the mean of its divisors is an integer number (3877671).

Almost surely, 2^28805478 is an apocalyptic number.

28805478 is an abundant number, since it is smaller than the sum of its proper divisors (33237258).

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

28805478 is a wasteful number, since it uses less digits than its factorization.

28805478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 369319.

The product of its (nonzero) digits is 143360, while the sum is 42.

The square root of 28805478 is about 5367.0735042479. The cubic root of 28805478 is about 306.5432061840.

The spelling of 28805478 in words is "twenty-eight million, eight hundred five thousand, four hundred seventy-eight".