28380783918 has 16 divisors (see below), whose sum is σ = 58295664720. Its totient is φ = 9204578496.

The previous prime is 28380783901. The next prime is 28380783919. The reversal of 28380783918 is 81938708382.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28380783919) 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 7 ways as a sum of consecutive naturals, for example, 63920463 + ... + 63920906.

It is an arithmetic number, because the mean of its divisors is an integer number (3643479045).

Almost surely, 2^28380783918 is an apocalyptic number.

28380783918 is an abundant number, since it is smaller than the sum of its proper divisors (29914880802).

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

28380783918 is a wasteful number, since it uses less digits than its factorization.

28380783918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127841411.

The product of its (nonzero) digits is 4644864, while the sum is 57.

The spelling of 28380783918 in words is "twenty-eight billion, three hundred eighty million, seven hundred eighty-three thousand, nine hundred eighteen".