891641193228 has 18 divisors (see below), whose sum is σ = 2253870794084. Its totient is φ = 297213731064.

The previous prime is 891641193217. The next prime is 891641193241. The reversal of 891641193228 is 822391146198.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×891641193228² (a number of 25 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12383905426 + ... + 12383905497.

Almost surely, 2^891641193228 is an apocalyptic number.

It is an amenable number.

891641193228 is an abundant number, since it is smaller than the sum of its proper divisors (1362229600856).

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

891641193228 is a wasteful number, since it uses less digits than its factorization.

891641193228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24767810933 (or 24767810928 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 54.

The spelling of 891641193228 in words is "eight hundred ninety-one billion, six hundred forty-one million, one hundred ninety-three thousand, two hundred twenty-eight".