28990155886 has 8 divisors (see below), whose sum is σ = 43545050640. Its totient is φ = 14475139008.

The previous prime is 28990155881. The next prime is 28990155907. The reversal of 28990155886 is 68855109982.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28990155881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9967651 + ... + 9970558.

It is an arithmetic number, because the mean of its divisors is an integer number (5443131330).

Almost surely, 2^28990155886 is an apocalyptic number.

28990155886 is a deficient number, since it is larger than the sum of its proper divisors (14554894754).

28990155886 is a wasteful number, since it uses less digits than its factorization.

28990155886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19938938.

The product of its (nonzero) digits is 12441600, while the sum is 61.

The spelling of 28990155886 in words is "twenty-eight billion, nine hundred ninety million, one hundred fifty-five thousand, eight hundred eighty-six".