28777799 has 8 divisors (see below), whose sum is σ = 30384000. Its totient is φ = 27180792.

The previous prime is 28777783. The next prime is 28777811. The reversal of 28777799 is 99777782.

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

It is not a de Polignac number, because 28777799 - 2⁴ = 28777783 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28777709) 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, 4712 + ... + 8930.

It is an arithmetic number, because the mean of its divisors is an integer number (3798000).

Almost surely, 2^28777799 is an apocalyptic number.

28777799 is a deficient number, since it is larger than the sum of its proper divisors (1606201).

28777799 is a wasteful number, since it uses less digits than its factorization.

28777799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4597.

The product of its digits is 3111696, while the sum is 56.

The square root of 28777799 is about 5364.4942911704. The cubic root of 28777799 is about 306.4449895818. Note that the first 3 decimals are identical.

The spelling of 28777799 in words is "twenty-eight million, seven hundred seventy-seven thousand, seven hundred ninety-nine".