891885646 has 4 divisors (see below), whose sum is σ = 1337828472. Its totient is φ = 445942822.

The previous prime is 891885641. The next prime is 891885647. The reversal of 891885646 is 646588198.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (891885641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 222971410 + ... + 222971413.

It is an arithmetic number, because the mean of its divisors is an integer number (334457118).

Almost surely, 2^891885646 is an apocalyptic number.

891885646 is a deficient number, since it is larger than the sum of its proper divisors (445942826).

891885646 is a wasteful number, since it uses less digits than its factorization.

891885646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 445942825.

The product of its digits is 3317760, while the sum is 55.

The square root of 891885646 is about 29864.4545572157. The cubic root of 891885646 is about 962.5790194528.

The spelling of 891885646 in words is "eight hundred ninety-one million, eight hundred eighty-five thousand, six hundred forty-six".