869909472 has 72 divisors (see below), whose sum is σ = 2477835360. Its totient is φ = 289497600.

The previous prime is 869909449. The next prime is 869909497. The reversal of 869909472 is 274909968.

869909472 is a `hidden beast` number, since 86 + 9 + 90 + 9 + 472 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 204972 + ... + 209172.

It is an arithmetic number, because the mean of its divisors is an integer number (34414380).

Almost surely, 2^869909472 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 869909472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1238917680).

869909472 is an abundant number, since it is smaller than the sum of its proper divisors (1607925888).

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

869909472 is a wasteful number, since it uses less digits than its factorization.

869909472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4936 (or 4925 counting only the distinct ones).

The product of its (nonzero) digits is 1959552, while the sum is 54.

The square root of 869909472 is about 29494.2277742612. The cubic root of 869909472 is about 954.6071580348.

The spelling of 869909472 in words is "eight hundred sixty-nine million, nine hundred nine thousand, four hundred seventy-two".