28540685 has 8 divisors (see below), whose sum is σ = 34327800. Its totient is φ = 22779904.

The previous prime is 28540657. The next prime is 28540693. The reversal of 28540685 is 58604582.

It can be written as a sum of positive squares in 4 ways, for example, as 10588516 + 17952169 = 3254^2 + 4237^2 .

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 28540685 - 2¹⁶ = 28475149 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4112 + ... + 8601.

It is an arithmetic number, because the mean of its divisors is an integer number (4290975).

Almost surely, 2^28540685 is an apocalyptic number.

It is an amenable number.

28540685 is a deficient number, since it is larger than the sum of its proper divisors (5787115).

28540685 is a wasteful number, since it uses less digits than its factorization.

28540685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13167.

The product of its (nonzero) digits is 76800, while the sum is 38.

The square root of 28540685 is about 5342.3482664461. The cubic root of 28540685 is about 305.6010185919.

The spelling of 28540685 in words is "twenty-eight million, five hundred forty thousand, six hundred eighty-five".