28694861 has 8 divisors (see below), whose sum is σ = 32720184. Its totient is φ = 24929280.

The previous prime is 28694849. The next prime is 28694899. The reversal of 28694861 is 16849682.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 5317636 + 23377225 = 2306^2 + 4835^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 28694861 - 2¹⁰ = 28693837 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28694801) 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, 64700 + ... + 65141.

It is an arithmetic number, because the mean of its divisors is an integer number (4090023).

Almost surely, 2^28694861 is an apocalyptic number.

It is an amenable number.

28694861 is a deficient number, since it is larger than the sum of its proper divisors (4025323).

28694861 is a wasteful number, since it uses less digits than its factorization.

28694861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129871.

The product of its digits is 165888, while the sum is 44.

The square root of 28694861 is about 5356.7584414457. The cubic root of 28694861 is about 306.1503134663.

The spelling of 28694861 in words is "twenty-eight million, six hundred ninety-four thousand, eight hundred sixty-one".