28005115438 has 8 divisors (see below), whose sum is σ = 42010803432. Its totient is φ = 14001514296.

The previous prime is 28005115421. The next prime is 28005115441. The reversal of 28005115438 is 83451150082.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 28005115397 and 28005115406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 487720 + ... + 542107.

It is an arithmetic number, because the mean of its divisors is an integer number (5251350429).

Almost surely, 2^28005115438 is an apocalyptic number.

28005115438 is a deficient number, since it is larger than the sum of its proper divisors (14005687994).

28005115438 is a wasteful number, since it uses less digits than its factorization.

28005115438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1043426.

The product of its (nonzero) digits is 38400, while the sum is 37.

The spelling of 28005115438 in words is "twenty-eight billion, five million, one hundred fifteen thousand, four hundred thirty-eight".