28056311438 has 8 divisors (see below), whose sum is σ = 42087884520. Its totient is φ = 14027016600.

The previous prime is 28056311417. The next prime is 28056311441. The reversal of 28056311438 is 83411365082.

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

It is a super-2 number, since 2×28056311438² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28056311395 and 28056311404.

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, 538433 + ... + 588236.

It is an arithmetic number, because the mean of its divisors is an integer number (5260985565).

Almost surely, 2^28056311438 is an apocalyptic number.

28056311438 is a deficient number, since it is larger than the sum of its proper divisors (14031573082).

28056311438 is a wasteful number, since it uses less digits than its factorization.

28056311438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1139122.

The product of its (nonzero) digits is 138240, while the sum is 41.

The spelling of 28056311438 in words is "twenty-eight billion, fifty-six million, three hundred eleven thousand, four hundred thirty-eight".