28438607998 has 16 divisors (see below), whose sum is σ = 47544423120. Its totient is φ = 12678512256.

The previous prime is 28438607987. The next prime is 28438608007. The reversal of 28438607998 is 89970683482.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22010661 + ... + 22011952.

It is an arithmetic number, because the mean of its divisors is an integer number (2971526445).

Almost surely, 2^28438607998 is an apocalyptic number.

28438607998 is a deficient number, since it is larger than the sum of its proper divisors (19105815122).

28438607998 is a wasteful number, since it uses less digits than its factorization.

28438607998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44022651.

The product of its (nonzero) digits is 41803776, while the sum is 64.

The spelling of 28438607998 in words is "twenty-eight billion, four hundred thirty-eight million, six hundred seven thousand, nine hundred ninety-eight".