72323705440 has 96 divisors (see below), whose sum is σ = 195322639680. Its totient is φ = 24790523904.

The previous prime is 72323705437. The next prime is 72323705449. The reversal of 72323705440 is 4450732327.

It is a self number, because there is not a number n which added to its sum of digits gives 72323705440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72323705449) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8679196 + ... + 8687524.

It is an arithmetic number, because the mean of its divisors is an integer number (2034610830).

Almost surely, 2^72323705440 is an apocalyptic number.

72323705440 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

72323705440 is an abundant number, since it is smaller than the sum of its proper divisors (122998934240).

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

72323705440 is a wasteful number, since it uses less digits than its factorization.

72323705440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16104 (or 16096 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 37.

The spelling of 72323705440 in words is "seventy-two billion, three hundred twenty-three million, seven hundred five thousand, four hundred forty".