28434685 has 8 divisors (see below), whose sum is σ = 35044056. Its totient is φ = 22132800.

The previous prime is 28434683. The next prime is 28434691. The reversal of 28434685 is 58643482.

It can be written as a sum of positive squares in 4 ways, for example, as 13271449 + 15163236 = 3643^2 + 3894^2 .

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

It is not a de Polignac number, because 28434685 - 2¹ = 28434683 is a prime.

It is a super-2 number, since 2×28434685² = 1617062622098450, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28434683) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76666 + ... + 77035.

It is an arithmetic number, because the mean of its divisors is an integer number (4380507).

Almost surely, 2^28434685 is an apocalyptic number.

It is an amenable number.

28434685 is a deficient number, since it is larger than the sum of its proper divisors (6609371).

28434685 is a wasteful number, since it uses less digits than its factorization.

28434685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153743.

The product of its digits is 184320, while the sum is 40.

The square root of 28434685 is about 5332.4183069223. The cubic root of 28434685 is about 305.2222155569. Note that the first 4 decimals are identical.

It can be divided in two parts, 284 and 34685, that added together give a square (34969 = 187²).

The spelling of 28434685 in words is "twenty-eight million, four hundred thirty-four thousand, six hundred eighty-five".