823511380 has 24 divisors (see below), whose sum is σ = 1758687840. Its totient is φ = 323820960.

The previous prime is 823511369. The next prime is 823511387. The reversal of 823511380 is 83115328.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (823511387) 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, 347766 + ... + 350125.

It is an arithmetic number, because the mean of its divisors is an integer number (73278660).

Almost surely, 2^823511380 is an apocalyptic number.

It is an amenable number.

823511380 is an abundant number, since it is smaller than the sum of its proper divisors (935176460).

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

823511380 is a wasteful number, since it uses less digits than its factorization.

823511380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 697959 (or 697957 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 823511380 is about 28696.8879845882. The cubic root of 823511380 is about 937.3242830375.

The spelling of 823511380 in words is "eight hundred twenty-three million, five hundred eleven thousand, three hundred eighty".