28136671478 has 4 divisors (see below), whose sum is σ = 42205007220. Its totient is φ = 14068335738.

The previous prime is 28136671477. The next prime is 28136671481. The reversal of 28136671478 is 87417663182.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28136671477) by changing a digit.

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 as a sum of consecutive naturals, namely, 7034167868 + ... + 7034167871.

It is an arithmetic number, because the mean of its divisors is an integer number (10551251805).

Almost surely, 2^28136671478 is an apocalyptic number.

28136671478 is a deficient number, since it is larger than the sum of its proper divisors (14068335742).

28136671478 is a wasteful number, since it uses less digits than its factorization.

28136671478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14068335741.

The product of its digits is 2709504, while the sum is 53.

The spelling of 28136671478 in words is "twenty-eight billion, one hundred thirty-six million, six hundred seventy-one thousand, four hundred seventy-eight".