823555540 has 24 divisors (see below), whose sum is σ = 1741914720. Its totient is φ = 327051168.

The previous prime is 823555507. The next prime is 823555541. The reversal of 823555540 is 45555328.

It is a happy number.

823555540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 823555540.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (823555541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 145342 + ... + 150901.

It is an arithmetic number, because the mean of its divisors is an integer number (72579780).

Almost surely, 2^823555540 is an apocalyptic number.

It is an amenable number.

823555540 is an abundant number, since it is smaller than the sum of its proper divisors (918359180).

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

823555540 is a wasteful number, since it uses less digits than its factorization.

823555540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296391 (or 296389 counting only the distinct ones).

The product of its (nonzero) digits is 120000, while the sum is 37.

The square root of 823555540 is about 28697.6573956830. The cubic root of 823555540 is about 937.3410371070.

The spelling of 823555540 in words is "eight hundred twenty-three million, five hundred fifty-five thousand, five hundred forty".