891489457806 has 16 divisors (see below), whose sum is σ = 1783229806800. Its totient is φ = 297121337408.

The previous prime is 891489457787. The next prime is 891489457813. The reversal of 891489457806 is 608754984198.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10407591 + ... + 10492898.

It is an arithmetic number, because the mean of its divisors is an integer number (111451862925).

Almost surely, 2^891489457806 is an apocalyptic number.

891489457806 is an abundant number, since it is smaller than the sum of its proper divisors (891740348994).

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

891489457806 is a wasteful number, since it uses less digits than its factorization.

891489457806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20907603.

The product of its (nonzero) digits is 139345920, while the sum is 69.

The spelling of 891489457806 in words is "eight hundred ninety-one billion, four hundred eighty-nine million, four hundred fifty-seven thousand, eight hundred six".