28155720194 has 8 divisors (see below), whose sum is σ = 48266948928. Its totient is φ = 12066737220.

The previous prime is 28155720157. The next prime is 28155720199. The reversal of 28155720194 is 49102755182.

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

It is not an unprimeable number, because it can be changed into a prime (28155720199) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1005561422 + ... + 1005561449.

It is an arithmetic number, because the mean of its divisors is an integer number (6033368616).

Almost surely, 2^28155720194 is an apocalyptic number.

28155720194 is a deficient number, since it is larger than the sum of its proper divisors (20111228734).

28155720194 is a wasteful number, since it uses less digits than its factorization.

28155720194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2011122880.

The product of its (nonzero) digits is 201600, while the sum is 44.

The spelling of 28155720194 in words is "twenty-eight billion, one hundred fifty-five million, seven hundred twenty thousand, one hundred ninety-four".