28704378 has 32 divisors (see below), whose sum is σ = 59316480. Its totient is φ = 9253440.

The previous prime is 28704371. The next prime is 28704397. The reversal of 28704378 is 87340782.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (28704371) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52788 + ... + 53328.

It is an arithmetic number, because the mean of its divisors is an integer number (1853640).

Almost surely, 2^28704378 is an apocalyptic number.

28704378 is an abundant number, since it is smaller than the sum of its proper divisors (30612102).

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

28704378 is a wasteful number, since it uses less digits than its factorization.

28704378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 822.

The product of its (nonzero) digits is 75264, while the sum is 39.

The square root of 28704378 is about 5357.6466848795. The cubic root of 28704378 is about 306.1841558847.

The spelling of 28704378 in words is "twenty-eight million, seven hundred four thousand, three hundred seventy-eight".