28047434 has 8 divisors (see below), whose sum is σ = 42761028. Its totient is φ = 13793760.

The previous prime is 28047431. The next prime is 28047451. The reversal of 28047434 is 43474082.

It can be written as a sum of positive squares in 2 ways, for example, as 25654225 + 2393209 = 5065^2 + 1547^2 .

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 28047434.

It is not an unprimeable number, because it can be changed into a prime (28047431) 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, 114827 + ... + 115070.

Almost surely, 2^28047434 is an apocalyptic number.

28047434 is a deficient number, since it is larger than the sum of its proper divisors (14713594).

28047434 is a wasteful number, since it uses less digits than its factorization.

28047434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229960.

The product of its (nonzero) digits is 21504, while the sum is 32.

The square root of 28047434 is about 5295.9828171927. The cubic root of 28047434 is about 303.8302737365.

The spelling of 28047434 in words is "twenty-eight million, forty-seven thousand, four hundred thirty-four".