869891904 has 420 divisors, whose sum is σ = 3163124484. Its totient is φ = 227598336.

The previous prime is 869891881. The next prime is 869891951. The reversal of 869891904 is 409198968.

It can be written as a sum of positive squares in 2 ways, for example, as 731594304 + 138297600 = 27048^2 + 11760^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 23510574 + ... + 23510610.

Almost surely, 2^869891904 is an apocalyptic number.

869891904 is a gapful number since it is divisible by the number (84) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 869891904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1581562242).

869891904 is an abundant number, since it is smaller than the sum of its proper divisors (2293232580).

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

869891904 is a wasteful number, since it uses less digits than its factorization.

869891904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100 (or 66 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 54.

The square root of 869891904 is about 29493.9299517714. The cubic root of 869891904 is about 954.6007318292.

The spelling of 869891904 in words is "eight hundred sixty-nine million, eight hundred ninety-one thousand, nine hundred four".