28385661 has 8 divisors (see below), whose sum is σ = 37930464. Its totient is φ = 18882320.

The previous prime is 28385659. The next prime is 28385663. The reversal of 28385661 is 16658382.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28385659) and next prime (28385663).

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 28385661 - 2¹ = 28385659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28385663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8730 + ... + 11531.

It is an arithmetic number, because the mean of its divisors is an integer number (4741308).

Almost surely, 2^28385661 is an apocalyptic number.

It is an amenable number.

28385661 is a deficient number, since it is larger than the sum of its proper divisors (9544803).

28385661 is a wasteful number, since it uses less digits than its factorization.

28385661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20731.

The product of its digits is 69120, while the sum is 39.

The square root of 28385661 is about 5327.8195352320. The cubic root of 28385661 is about 305.0467043054.

The spelling of 28385661 in words is "twenty-eight million, three hundred eighty-five thousand, six hundred sixty-one".