28406065 has 8 divisors (see below), whose sum is σ = 36092520. Its totient is φ = 21388032.

The previous prime is 28406029. The next prime is 28406069. The reversal of 28406065 is 56060482.

It can be written as a sum of positive squares in 4 ways, for example, as 4941729 + 23464336 = 2223^2 + 4844^2 .

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 28406065 - 2¹¹ = 28404017 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28406069) 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, 167010 + ... + 167179.

It is an arithmetic number, because the mean of its divisors is an integer number (4511565).

Almost surely, 2^28406065 is an apocalyptic number.

It is an amenable number.

28406065 is a deficient number, since it is larger than the sum of its proper divisors (7686455).

28406065 is a wasteful number, since it uses less digits than its factorization.

28406065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334211.

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 28406065 is about 5329.7340458976. The cubic root of 28406065 is about 305.1197773757.

The spelling of 28406065 in words is "twenty-eight million, four hundred six thousand, sixty-five".