869291136 has 128 divisors (see below), whose sum is σ = 2932214400. Its totient is φ = 248361984.

The previous prime is 869291131. The next prime is 869291149. The reversal of 869291136 is 631192968.

It is a happy number.

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

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 869291091 and 869291100.

It is not an unprimeable number, because it can be changed into a prime (869291131) 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 15 ways as a sum of consecutive naturals, for example, 6226 + ... + 42158.

It is an arithmetic number, because the mean of its divisors is an integer number (22907925).

Almost surely, 2^869291136 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 869291136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1466107200).

869291136 is an abundant number, since it is smaller than the sum of its proper divisors (2062923264).

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

869291136 is a wasteful number, since it uses less digits than its factorization.

869291136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35963 (or 35945 counting only the distinct ones).

The product of its digits is 139968, while the sum is 45.

The square root of 869291136 is about 29483.7435886286. The cubic root of 869291136 is about 954.3809245775.

The spelling of 869291136 in words is "eight hundred sixty-nine million, two hundred ninety-one thousand, one hundred thirty-six".