28155809994 has 48 divisors (see below), whose sum is σ = 62127106272. Its totient is φ = 8499850944.

The previous prime is 28155809987. The next prime is 28155809999. The reversal of 28155809994 is 49990855182.

It is not an unprimeable number, because it can be changed into a prime (28155809999) 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 in 23 ways as a sum of consecutive naturals, for example, 208212 + ... + 315695.

It is an arithmetic number, because the mean of its divisors is an integer number (1294314714).

Almost surely, 2^28155809994 is an apocalyptic number.

28155809994 is an abundant number, since it is smaller than the sum of its proper divisors (33971296278).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28155809994 is a wasteful number, since it uses less digits than its factorization.

28155809994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 523991 (or 523978 counting only the distinct ones).

The product of its (nonzero) digits is 9331200, while the sum is 60.

The spelling of 28155809994 in words is "twenty-eight billion, one hundred fifty-five million, eight hundred nine thousand, nine hundred ninety-four".