844640896 has 64 divisors (see below), whose sum is σ = 1932328800. Its totient is φ = 363709440.

The previous prime is 844640893. The next prime is 844640897. The reversal of 844640896 is 698046448.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (64).

It is not an unprimeable number, because it can be changed into a prime (844640893) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10966 + ... + 42538.

Almost surely, 2^844640896 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 844640896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (966164400).

844640896 is an abundant number, since it is smaller than the sum of its proper divisors (1087687904).

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

844640896 is a wasteful number, since it uses less digits than its factorization.

844640896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31617 (or 31605 counting only the distinct ones).

The product of its (nonzero) digits is 1327104, while the sum is 49.

The square root of 844640896 is about 29062.7062745368. The cubic root of 844640896 is about 945.2732507681.

The spelling of 844640896 in words is "eight hundred forty-four million, six hundred forty thousand, eight hundred ninety-six".