28709434 has 8 divisors (see below), whose sum is σ = 46376820. Its totient is φ = 13250496.

The previous prime is 28709419. The next prime is 28709453. The reversal of 28709434 is 43490782.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 28590409 + 119025 = 5347^2 + 345^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 28709393 and 28709402.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 552079 + ... + 552130.

Almost surely, 2^28709434 is an apocalyptic number.

28709434 is a deficient number, since it is larger than the sum of its proper divisors (17667386).

28709434 is a wasteful number, since it uses less digits than its factorization.

28709434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1104224.

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 28709434 is about 5358.1185130603. The cubic root of 28709434 is about 306.2021319603.

The spelling of 28709434 in words is "twenty-eight million, seven hundred nine thousand, four hundred thirty-four".