28705434 has 8 divisors (see below), whose sum is σ = 57410880. Its totient is φ = 9568476.

The previous prime is 28705427. The next prime is 28705487. The reversal of 28705434 is 43450782.

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

28705434 is an admirable number.

It is a super-2 number, since 2×28705434² = 1648003882256712, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 28705395 and 28705404.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2392114 + ... + 2392125.

It is an arithmetic number, because the mean of its divisors is an integer number (7176360).

Almost surely, 2^28705434 is an apocalyptic number.

28705434 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.

28705434 is a wasteful number, since it uses less digits than its factorization.

28705434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4784244.

The product of its (nonzero) digits is 26880, while the sum is 33.

The square root of 28705434 is about 5357.7452347046. The cubic root of 28705434 is about 306.1879105559.

The spelling of 28705434 in words is "twenty-eight million, seven hundred five thousand, four hundred thirty-four".