28378465 has 8 divisors (see below), whose sum is σ = 34139880. Its totient is φ = 22645632.

The previous prime is 28378421. The next prime is 28378507. The reversal of 28378465 is 56487382.

It can be written as a sum of positive squares in 4 ways, for example, as 2663424 + 25715041 = 1632^2 + 5071^2 .

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 28378465 - 2⁹ = 28377953 is a prime.

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, 4894 + ... + 8983.

It is an arithmetic number, because the mean of its divisors is an integer number (4267485).

Almost surely, 2^28378465 is an apocalyptic number.

It is an amenable number.

28378465 is a deficient number, since it is larger than the sum of its proper divisors (5761415).

28378465 is a wasteful number, since it uses less digits than its factorization.

28378465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14291.

The product of its digits is 322560, while the sum is 43.

The square root of 28378465 is about 5327.1441692524. The cubic root of 28378465 is about 305.0209248387.

The spelling of 28378465 in words is "twenty-eight million, three hundred seventy-eight thousand, four hundred sixty-five".