28385817 has 8 divisors (see below), whose sum is σ = 38771040. Its totient is φ = 18462240.

The previous prime is 28385813. The next prime is 28385837. The reversal of 28385817 is 71858382.

28385817 = T₁₉₃ + T₁₉₄ + ... + T₅₆₁.

It is a happy number.

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

It is not a de Polignac number, because 28385817 - 2² = 28385813 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28385813) 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, 115267 + ... + 115512.

It is an arithmetic number, because the mean of its divisors is an integer number (4846380).

Almost surely, 2^28385817 is an apocalyptic number.

It is an amenable number.

28385817 is a deficient number, since it is larger than the sum of its proper divisors (10385223).

28385817 is a wasteful number, since it uses less digits than its factorization.

28385817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230823.

The product of its digits is 107520, while the sum is 42.

The square root of 28385817 is about 5327.8341753474. The cubic root of 28385817 is about 305.0472631227.

The spelling of 28385817 in words is "twenty-eight million, three hundred eighty-five thousand, eight hundred seventeen".