823638872 has 16 divisors (see below), whose sum is σ = 1764940560. Its totient is φ = 352988064.

The previous prime is 823638863. The next prime is 823638913. The reversal of 823638872 is 278836328.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7353863 + ... + 7353974.

It is an arithmetic number, because the mean of its divisors is an integer number (110308785).

Almost surely, 2^823638872 is an apocalyptic number.

It is an amenable number.

823638872 is an abundant number, since it is smaller than the sum of its proper divisors (941301688).

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

823638872 is a wasteful number, since it uses less digits than its factorization.

823638872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14707850 (or 14707846 counting only the distinct ones).

The product of its digits is 774144, while the sum is 47.

The square root of 823638872 is about 28699.1092544699. The cubic root of 823638872 is about 937.3726511937.

The spelling of 823638872 in words is "eight hundred twenty-three million, six hundred thirty-eight thousand, eight hundred seventy-two".