28704478 has 32 divisors (see below), whose sum is σ = 50624640. Its totient is φ = 12065760.

The previous prime is 28704457. The next prime is 28704479. The reversal of 28704478 is 87440782.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 28704478.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28704479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17176 + ... + 18772.

It is an arithmetic number, because the mean of its divisors is an integer number (1582020).

Almost surely, 2^28704478 is an apocalyptic number.

28704478 is a deficient number, since it is larger than the sum of its proper divisors (21920162).

28704478 is a wasteful number, since it uses less digits than its factorization.

28704478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1672.

The product of its (nonzero) digits is 100352, while the sum is 40.

The square root of 28704478 is about 5357.6560173270. The cubic root of 28704478 is about 306.1845114446.

The spelling of 28704478 in words is "twenty-eight million, seven hundred four thousand, four hundred seventy-eight".