28378434 has 32 divisors (see below), whose sum is σ = 65024640. Its totient is φ = 8088192.

The previous prime is 28378421. The next prime is 28378507. The reversal of 28378434 is 43487382.

It is a junction number, because it is equal to n+sod(n) for n = 28378392 and 28378401.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29302 + ... + 30254.

It is an arithmetic number, because the mean of its divisors is an integer number (2032020).

Almost surely, 2^28378434 is an apocalyptic number.

28378434 is an abundant number, since it is smaller than the sum of its proper divisors (36646206).

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

28378434 is a wasteful number, since it uses less digits than its factorization.

28378434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1674.

The product of its digits is 129024, while the sum is 39.

The square root of 28378434 is about 5327.1412596251. The cubic root of 28378434 is about 305.0208137726.

The spelling of 28378434 in words is "twenty-eight million, three hundred seventy-eight thousand, four hundred thirty-four".