823440280 has 32 divisors (see below), whose sum is σ = 1995260400. Its totient is φ = 304039296.

The previous prime is 823440253. The next prime is 823440283. The reversal of 823440280 is 82044328.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (823440283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 791250 + ... + 792289.

Almost surely, 2^823440280 is an apocalyptic number.

It is an amenable number.

823440280 is an abundant number, since it is smaller than the sum of its proper divisors (1171820120).

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

823440280 is a wasteful number, since it uses less digits than its factorization.

823440280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1583563 (or 1583559 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 31.

The square root of 823440280 is about 28695.6491475624. The cubic root of 823440280 is about 937.2973068167.

The spelling of 823440280 in words is "eight hundred twenty-three million, four hundred forty thousand, two hundred eighty".