891440448 has 56 divisors (see below), whose sum is σ = 2366345280. Its totient is φ = 296171520.

The previous prime is 891440447. The next prime is 891440453. The reversal of 891440448 is 844044198.

It is a Cunningham number, because it is equal to 29857²-1.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (891440447) 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 7 ways as a sum of consecutive naturals, for example, 52248 + ... + 67176.

Almost surely, 2^891440448 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 891440448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1183172640).

891440448 is an abundant number, since it is smaller than the sum of its proper divisors (1474904832).

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

891440448 is a wasteful number, since it uses less digits than its factorization.

891440448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15255 (or 15245 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 42.

The square root of 891440448 is about 29856.9999832535. Note that the first 4 decimals coincide. The cubic root of 891440448 is about 962.4188309130.

The spelling of 891440448 in words is "eight hundred ninety-one million, four hundred forty thousand, four hundred forty-eight".