28408212608 has 16 divisors (see below), whose sum is σ = 56594486310. Its totient is φ = 14204106240.

The previous prime is 28408212607. The next prime is 28408212649. The reversal of 28408212608 is 80621280482.

It can be written as a sum of positive squares in only one way, i.e., 22096227904 + 6311984704 = 148648^2 + 79448^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is not an unprimeable number, because it can be changed into a prime (28408212607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110969453 + ... + 110969708.

Almost surely, 2^28408212608 is an apocalyptic number.

It is an amenable number.

28408212608 is a deficient number, since it is larger than the sum of its proper divisors (28186273702).

28408212608 is an equidigital number, since it uses as much as digits as its factorization.

28408212608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221939175 (or 221939163 counting only the distinct ones).

The product of its (nonzero) digits is 98304, while the sum is 41.

The spelling of 28408212608 in words is "twenty-eight billion, four hundred eight million, two hundred twelve thousand, six hundred eight".