28778795 has 8 divisors (see below), whose sum is σ = 34640880. Its totient is φ = 22952160.

The previous prime is 28778777. The next prime is 28778797. The reversal of 28778795 is 59787782.

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

It is not a de Polignac number, because 28778795 - 2²² = 24584491 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28778797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7040 + ... + 10349.

It is an arithmetic number, because the mean of its divisors is an integer number (4330110).

Almost surely, 2^28778795 is an apocalyptic number.

28778795 is a deficient number, since it is larger than the sum of its proper divisors (5862085).

28778795 is a wasteful number, since it uses less digits than its factorization.

28778795 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17725.

The product of its digits is 1975680, while the sum is 53.

The square root of 28778795 is about 5364.5871229760. The cubic root of 28778795 is about 306.4485248961.

The spelling of 28778795 in words is "twenty-eight million, seven hundred seventy-eight thousand, seven hundred ninety-five".