28778065 has 8 divisors (see below), whose sum is σ = 36351360. Its totient is φ = 21810672.

The previous prime is 28778047. The next prime is 28778111. The reversal of 28778065 is 56087782.

It is a happy number.

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 28778065 - 2⁷ = 28777937 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, 151369 + ... + 151558.

It is an arithmetic number, because the mean of its divisors is an integer number (4543920).

Almost surely, 2^28778065 is an apocalyptic number.

It is an amenable number.

28778065 is a deficient number, since it is larger than the sum of its proper divisors (7573295).

28778065 is a wasteful number, since it uses less digits than its factorization.

28778065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302951.

The product of its (nonzero) digits is 188160, while the sum is 43.

The square root of 28778065 is about 5364.5190837576. The cubic root of 28778065 is about 306.4459337601.

The spelling of 28778065 in words is "twenty-eight million, seven hundred seventy-eight thousand, sixty-five".