28308505488 has 40 divisors (see below), whose sum is σ = 73143943488. Its totient is φ = 9434408832.

The previous prime is 28308505483. The next prime is 28308505493. The reversal of 28308505488 is 88450580382.

It is an interprime number because it is at equal distance from previous prime (28308505483) and next prime (28308505493).

It is a super-2 number, since 2×28308505488² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28308505488.

It is not an unprimeable number, because it can be changed into a prime (28308505481) 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, 219181 + ... + 323507.

Almost surely, 2^28308505488 is an apocalyptic number.

It is an amenable number.

28308505488 is an abundant number, since it is smaller than the sum of its proper divisors (44835438000).

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

28308505488 is a wasteful number, since it uses less digits than its factorization.

28308505488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109991 (or 109985 counting only the distinct ones).

The product of its (nonzero) digits is 2457600, while the sum is 51.

The spelling of 28308505488 in words is "twenty-eight billion, three hundred eight million, five hundred five thousand, four hundred eighty-eight".