28126431648 has 144 divisors (see below), whose sum is σ = 93640712256. Its totient is φ = 7840097280.

The previous prime is 28126431647. The next prime is 28126431649. The reversal of 28126431648 is 84613462182.

It is an interprime number because it is at equal distance from previous prime (28126431647) and next prime (28126431649).

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

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (28126431647) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 87486 + ... + 252797.

It is an arithmetic number, because the mean of its divisors is an integer number (650282724).

Almost surely, 2^28126431648 is an apocalyptic number.

28126431648 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

28126431648 is an abundant number, since it is smaller than the sum of its proper divisors (65514280608).

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

28126431648 is a wasteful number, since it uses less digits than its factorization.

28126431648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340347 (or 340336 counting only the distinct ones).

The product of its digits is 442368, while the sum is 45.

The spelling of 28126431648 in words is "twenty-eight billion, one hundred twenty-six million, four hundred thirty-one thousand, six hundred forty-eight".