891963664 has 20 divisors (see below), whose sum is σ = 1819137040. Its totient is φ = 422508960.

The previous prime is 891963661. The next prime is 891963671. The reversal of 891963664 is 466369198.

It is not an unprimeable number, because it can be changed into a prime (891963661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1466742 + ... + 1467349.

It is an arithmetic number, because the mean of its divisors is an integer number (90956852).

Almost surely, 2^891963664 is an apocalyptic number.

It is an amenable number.

891963664 is an abundant number, since it is smaller than the sum of its proper divisors (927173376).

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

891963664 is a wasteful number, since it uses less digits than its factorization.

891963664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2934118 (or 2934112 counting only the distinct ones).

The product of its digits is 1679616, while the sum is 52.

The square root of 891963664 is about 29865.7607303079. The cubic root of 891963664 is about 962.6070859434.

The spelling of 891963664 in words is "eight hundred ninety-one million, nine hundred sixty-three thousand, six hundred sixty-four".