28478118 has 16 divisors (see below), whose sum is σ = 57015216. Its totient is φ = 9482880.

The previous prime is 28478113. The next prime is 28478129. The reversal of 28478118 is 81187482.

It is a happy number.

It is a super-2 number, since 2×28478118² = 1622006409643848, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28478113) 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, 6130 + ... + 9722.

It is an arithmetic number, because the mean of its divisors is an integer number (3563451).

Almost surely, 2^28478118 is an apocalyptic number.

28478118 is an abundant number, since it is smaller than the sum of its proper divisors (28537098).

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

28478118 is a wasteful number, since it uses less digits than its factorization.

28478118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4919.

The product of its digits is 28672, while the sum is 39.

The square root of 28478118 is about 5336.4892954076. The cubic root of 28478118 is about 305.3775419653.

The spelling of 28478118 in words is "twenty-eight million, four hundred seventy-eight thousand, one hundred eighteen".