28491890194 has 8 divisors (see below), whose sum is σ = 42743798460. Its totient is φ = 14243957376.

The previous prime is 28491890183. The next prime is 28491890221. The reversal of 28491890194 is 49109819482.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 25756077169 + 2735813025 = 160487^2 + 52305^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 975879 + ... + 1004650.

Almost surely, 2^28491890194 is an apocalyptic number.

28491890194 is a deficient number, since it is larger than the sum of its proper divisors (14251908266).

28491890194 is a wasteful number, since it uses less digits than its factorization.

28491890194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1987724.

The product of its (nonzero) digits is 1492992, while the sum is 55.

The spelling of 28491890194 in words is "twenty-eight billion, four hundred ninety-one million, eight hundred ninety thousand, one hundred ninety-four".