72431689405 has 4 divisors (see below), whose sum is σ = 86918027292. Its totient is φ = 57945351520.

The previous prime is 72431689403. The next prime is 72431689417. The reversal of 72431689405 is 50498613427.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 32523236964 + 39908452441 = 180342^2 + 199771^2 .

It is not a de Polignac number, because 72431689405 - 2¹ = 72431689403 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72431689403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7243168936 + ... + 7243168945.

It is an arithmetic number, because the mean of its divisors is an integer number (21729506823).

It is a 1-persistent number, because it is pandigital, but 2⋅72431689405 = 144863378810 is not.

Almost surely, 2^72431689405 is an apocalyptic number.

It is an amenable number.

72431689405 is a deficient number, since it is larger than the sum of its proper divisors (14486337887).

72431689405 is a wasteful number, since it uses less digits than its factorization.

72431689405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14486337886.

The product of its (nonzero) digits is 1451520, while the sum is 49.

The spelling of 72431689405 in words is "seventy-two billion, four hundred thirty-one million, six hundred eighty-nine thousand, four hundred five".