28615919904 has 144 divisors (see below), whose sum is σ = 95603324544. Its totient is φ = 8004441600.

The previous prime is 28615919903. The next prime is 28615919909. The reversal of 28615919904 is 40991951682.

28615919904 is a `hidden beast` number, since 2 + 8 + 615 + 9 + 19 + 9 + 0 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is not an unprimeable number, because it can be changed into a prime (28615919903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 306232 + ... + 388599.

It is an arithmetic number, because the mean of its divisors is an integer number (663911976).

Almost surely, 2^28615919904 is an apocalyptic number.

28615919904 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

28615919904 is an abundant number, since it is smaller than the sum of its proper divisors (66987404640).

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

28615919904 is a wasteful number, since it uses less digits than its factorization.

28615919904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 694871 (or 694860 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 54.

The spelling of 28615919904 in words is "twenty-eight billion, six hundred fifteen million, nine hundred nineteen thousand, nine hundred four".