823136633840 has 40 divisors (see below), whose sum is σ = 1975527927168. Its totient is φ = 318633534720.

The previous prime is 823136633777. The next prime is 823136633843. The reversal of 823136633840 is 48336631328.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (823136633843) 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, 165952487 + ... + 165957446.

Almost surely, 2^823136633840 is an apocalyptic number.

823136633840 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

823136633840 is an abundant number, since it is smaller than the sum of its proper divisors (1152391293328).

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

823136633840 is a wasteful number, since it uses less digits than its factorization.

823136633840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331909977 (or 331909971 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 47.

The spelling of 823136633840 in words is "eight hundred twenty-three billion, one hundred thirty-six million, six hundred thirty-three thousand, eight hundred forty".