823431456 has 36 divisors (see below), whose sum is σ = 2341634022. Its totient is φ = 274477056.

The previous prime is 823431449. The next prime is 823431491. The reversal of 823431456 is 654134328.

It can be written as a sum of positive squares in only one way, i.e., 662547600 + 160883856 = 25740^2 + 12684^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 823431456.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1429281 + ... + 1429856.

Almost surely, 2^823431456 is an apocalyptic number.

It is an amenable number.

823431456 is an abundant number, since it is smaller than the sum of its proper divisors (1518202566).

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

823431456 is a wasteful number, since it uses less digits than its factorization.

823431456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2859153 (or 2859142 counting only the distinct ones).

The product of its digits is 69120, while the sum is 36.

The square root of 823431456 is about 28695.4953956192. The cubic root of 823431456 is about 937.2939587735.

The spelling of 823431456 in words is "eight hundred twenty-three million, four hundred thirty-one thousand, four hundred fifty-six".