28329777 has 16 divisors (see below), whose sum is σ = 47966080. Its totient is φ = 16188336.

The previous prime is 28329757. The next prime is 28329787. The reversal of 28329777 is 77792382.

It is not a de Polignac number, because 28329777 - 2⁷ = 28329649 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 (28329757) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74758 + ... + 75135.

It is an arithmetic number, because the mean of its divisors is an integer number (2997880).

Almost surely, 2^28329777 is an apocalyptic number.

28329777 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

28329777 is a deficient number, since it is larger than the sum of its proper divisors (19636303).

28329777 is a wasteful number, since it uses less digits than its factorization.

28329777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149909 (or 149903 counting only the distinct ones).

The product of its digits is 296352, while the sum is 45.

The square root of 28329777 is about 5322.5724043924. The cubic root of 28329777 is about 304.8463868579.

The spelling of 28329777 in words is "twenty-eight million, three hundred twenty-nine thousand, seven hundred seventy-seven".