28478244 has 12 divisors (see below), whose sum is σ = 66449264. Its totient is φ = 9492744.

The previous prime is 28478237. The next prime is 28478251. The reversal of 28478244 is 44287482.

It is an interprime number because it is at equal distance from previous prime (28478237) and next prime (28478251).

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×28478244² = 1622020762647072, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1186582 + ... + 1186605.

Almost surely, 2^28478244 is an apocalyptic number.

It is an amenable number.

28478244 is an abundant number, since it is smaller than the sum of its proper divisors (37971020).

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

28478244 is a wasteful number, since it uses less digits than its factorization.

28478244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2373194 (or 2373192 counting only the distinct ones).

The product of its digits is 114688, while the sum is 39.

The square root of 28478244 is about 5336.5011009087. The cubic root of 28478244 is about 305.3779923405.

The spelling of 28478244 in words is "twenty-eight million, four hundred seventy-eight thousand, two hundred forty-four".