869729280 has 176 divisors, whose sum is σ = 3179564160. Its totient is φ = 198770688.

The previous prime is 869729279. The next prime is 869729297. The reversal of 869729280 is 82927968.

It is a happy number.

It is an unprimeable number.

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, 103476 + ... + 111564.

Almost surely, 2^869729280 is an apocalyptic number.

869729280 is a gapful number since it is divisible by the number (80) 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 869729280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1589782080).

869729280 is an abundant number, since it is smaller than the sum of its proper divisors (2309834880).

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

869729280 is a wasteful number, since it uses less digits than its factorization.

869729280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8124 (or 8106 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 51.

The square root of 869729280 is about 29491.1729166542. The cubic root of 869729280 is about 954.5412414244.

The spelling of 869729280 in words is "eight hundred sixty-nine million, seven hundred twenty-nine thousand, two hundred eighty".