28780383 has 32 divisors (see below), whose sum is σ = 43660800. Its totient is φ = 16765056.

The previous prime is 28780379. The next prime is 28780391. The reversal of 28780383 is 38308782.

It is a happy number.

It is not a de Polignac number, because 28780383 - 2² = 28780379 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28780313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 37641 + ... + 38397.

It is an arithmetic number, because the mean of its divisors is an integer number (1364400).

Almost surely, 2^28780383 is an apocalyptic number.

28780383 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

28780383 is a deficient number, since it is larger than the sum of its proper divisors (14880417).

28780383 is a wasteful number, since it uses less digits than its factorization.

28780383 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 831.

The product of its (nonzero) digits is 64512, while the sum is 39.

The square root of 28780383 is about 5364.7351285968. The cubic root of 28780383 is about 306.4541613529.

The spelling of 28780383 in words is "twenty-eight million, seven hundred eighty thousand, three hundred eighty-three".