28779766 has 4 divisors (see below), whose sum is σ = 43169652. Its totient is φ = 14389882.

The previous prime is 28779743. The next prime is 28779781. The reversal of 28779766 is 66797782.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66797782 = 2 ⋅33398891.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7194940 + ... + 7194943.

It is an arithmetic number, because the mean of its divisors is an integer number (10792413).

Almost surely, 2^28779766 is an apocalyptic number.

28779766 is a deficient number, since it is larger than the sum of its proper divisors (14389886).

28779766 is a wasteful number, since it uses less digits than its factorization.

28779766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14389885.

The product of its digits is 1778112, while the sum is 52.

The square root of 28779766 is about 5364.6776231196. The cubic root of 28779766 is about 306.4519713940.

The spelling of 28779766 in words is "twenty-eight million, seven hundred seventy-nine thousand, seven hundred sixty-six".