28207979748 has 72 divisors (see below), whose sum is σ = 77016678648. Its totient is φ = 8653575168.

The previous prime is 28207979731. The next prime is 28207979771. The reversal of 28207979748 is 84797970282.

It can be written as a sum of positive squares in 4 ways, for example, as 441756324 + 27766223424 = 21018^2 + 166632^2 .

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 68290 + ... + 247142.

Almost surely, 2^28207979748 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28207979748, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38508339324).

28207979748 is an abundant number, since it is smaller than the sum of its proper divisors (48808698900).

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

28207979748 is a wasteful number, since it uses less digits than its factorization.

28207979748 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179213 (or 179208 counting only the distinct ones).

The product of its (nonzero) digits is 28449792, while the sum is 63.

The spelling of 28207979748 in words is "twenty-eight billion, two hundred seven million, nine hundred seventy-nine thousand, seven hundred forty-eight".