28040478 has 8 divisors (see below), whose sum is σ = 56080968. Its totient is φ = 9346824.

The previous prime is 28040449. The next prime is 28040479. The reversal of 28040478 is 87404082.

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

28040478 is an admirable number.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28040479) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2336701 + ... + 2336712.

It is an arithmetic number, because the mean of its divisors is an integer number (7010121).

Almost surely, 2^28040478 is an apocalyptic number.

28040478 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.

28040478 is a wasteful number, since it uses less digits than its factorization.

28040478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4673418.

The product of its (nonzero) digits is 14336, while the sum is 33.

The square root of 28040478 is about 5295.3260522842. The cubic root of 28040478 is about 303.8051541703.

The spelling of 28040478 in words is "twenty-eight million, forty thousand, four hundred seventy-eight".