28777785 has 8 divisors (see below), whose sum is σ = 46044480. Its totient is φ = 15348144.

The previous prime is 28777783. The next prime is 28777811. The reversal of 28777785 is 58777782.

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

It is not a de Polignac number, because 28777785 - 2¹ = 28777783 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28777783) 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, 959245 + ... + 959274.

It is an arithmetic number, because the mean of its divisors is an integer number (5755560).

Almost surely, 2^28777785 is an apocalyptic number.

It is an amenable number.

28777785 is a deficient number, since it is larger than the sum of its proper divisors (17266695).

28777785 is a wasteful number, since it uses less digits than its factorization.

28777785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1918527.

The product of its digits is 1536640, while the sum is 51.

The square root of 28777785 is about 5364.4929862942. The cubic root of 28777785 is about 306.4449398881. Note that the first 3 decimals are identical.

The spelling of 28777785 in words is "twenty-eight million, seven hundred seventy-seven thousand, seven hundred eighty-five".