28775478 has 8 divisors (see below), whose sum is σ = 57550968. Its totient is φ = 9591824.

The previous prime is 28775477. The next prime is 28775491. The reversal of 28775478 is 87457782.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

28775478 is an admirable number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28775477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2397951 + ... + 2397962.

It is an arithmetic number, because the mean of its divisors is an integer number (7193871).

Almost surely, 2^28775478 is an apocalyptic number.

28775478 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

28775478 is a wasteful number, since it uses less digits than its factorization.

28775478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4795918.

The product of its digits is 878080, while the sum is 48.

The square root of 28775478 is about 5364.2779570041. The cubic root of 28775478 is about 306.4367508472.

The spelling of 28775478 in words is "twenty-eight million, seven hundred seventy-five thousand, four hundred seventy-eight".