28491690489444 has 72 divisors (see below), whose sum is σ = 88640814866240. Its totient is φ = 7514291996352.

The previous prime is 28491690489419. The next prime is 28491690489547. The reversal of 28491690489444 is 44498409619482.

28491690489444 is a `hidden beast` number, since 2 + 8 + 4 + 9 + 16 + 90 + 4 + 89 + 444 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4348545334 + ... + 4348551885.

Almost surely, 2^{28491690489444} is an apocalyptic number.

It is an amenable number.

28491690489444 is an abundant number, since it is smaller than the sum of its proper divisors (60149124376796).

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

28491690489444 is a wasteful number, since it uses less digits than its factorization.

28491690489444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8697097249 (or 8697097244 counting only the distinct ones).

The product of its (nonzero) digits is 573308928, while the sum is 72.

The spelling of 28491690489444 in words is "twenty-eight trillion, four hundred ninety-one billion, six hundred ninety million, four hundred eighty-nine thousand, four hundred forty-four".