28340385 has 8 divisors (see below), whose sum is σ = 45344640. Its totient is φ = 15114864.

The previous prime is 28340383. The next prime is 28340387. The reversal of 28340385 is 58304382.

It is an interprime number because it is at equal distance from previous prime (28340383) and next prime (28340387).

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

It is not a de Polignac number, because 28340385 - 2¹ = 28340383 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28340383) 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, 944665 + ... + 944694.

It is an arithmetic number, because the mean of its divisors is an integer number (5668080).

Almost surely, 2^28340385 is an apocalyptic number.

It is an amenable number.

28340385 is a deficient number, since it is larger than the sum of its proper divisors (17004255).

28340385 is a wasteful number, since it uses less digits than its factorization.

28340385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1889367.

The product of its (nonzero) digits is 23040, while the sum is 33.

The square root of 28340385 is about 5323.5688217586. The cubic root of 28340385 is about 304.8844317147.

The spelling of 28340385 in words is "twenty-eight million, three hundred forty thousand, three hundred eighty-five".