28777782 has 16 divisors (see below), whose sum is σ = 62788032. Its totient is φ = 8720520.

The previous prime is 28777769. The next prime is 28777783.

28777782 is nontrivially palindromic in base 10.

It is a congruent number.

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, 217948 + ... + 218079.

It is an arithmetic number, because the mean of its divisors is an integer number (3924252).

Almost surely, 2^28777782 is an apocalyptic number.

28777782 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

28777782 is an abundant number, since it is smaller than the sum of its proper divisors (34010250).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28777782 is a wasteful number, since it uses less digits than its factorization.

28777782 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 436043.

The product of its digits is 614656, while the sum is 48.

The square root of 28777782 is about 5364.4927066779. The cubic root of 28777782 is about 306.4449292394. Note that the first 3 decimals are identical.

The spelling of 28777782 in words is "twenty-eight million, seven hundred seventy-seven thousand, seven hundred eighty-two".