897139584 has 128 divisors (see below), whose sum is σ = 2888640000. Its totient is φ = 271848960.

The previous prime is 897139571. The next prime is 897139591. The reversal of 897139584 is 485931798.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 897139584.

It is a congruent number.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 26217 + ... + 49815.

It is an arithmetic number, because the mean of its divisors is an integer number (22567500).

Almost surely, 2^897139584 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 897139584, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1444320000).

897139584 is an abundant number, since it is smaller than the sum of its proper divisors (1991500416).

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

897139584 is a wasteful number, since it uses less digits than its factorization.

897139584 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23633 (or 23615 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 54.

The square root of 897139584 is about 29952.2884601494. The cubic root of 897139584 is about 964.4654467376.

The spelling of 897139584 in words is "eight hundred ninety-seven million, one hundred thirty-nine thousand, five hundred eighty-four".