28217478 has 16 divisors (see below), whose sum is σ = 56545776. Its totient is φ = 9387360.

The previous prime is 28217477. The next prime is 28217507. The reversal of 28217478 is 87471282.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28217473) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1101 + ... + 7592.

It is an arithmetic number, because the mean of its divisors is an integer number (3534111).

Almost surely, 2^28217478 is an apocalyptic number.

28217478 is an abundant number, since it is smaller than the sum of its proper divisors (28328298).

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

28217478 is a wasteful number, since it uses less digits than its factorization.

28217478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9239.

The product of its digits is 50176, while the sum is 39.

The square root of 28217478 is about 5312.0126129368. The cubic root of 28217478 is about 304.4430506011.

The spelling of 28217478 in words is "twenty-eight million, two hundred seventeen thousand, four hundred seventy-eight".