72120243678 has 16 divisors (see below), whose sum is σ = 164846271360. Its totient is φ = 20605783896.

The previous prime is 72120243673. The next prime is 72120243721. The reversal of 72120243678 is 87634202127.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 1717148659 = 72120243678 / (7 + 2 + 1 + 2 + 0 + 2 + 4 + 3 + 6 + 7 + 8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72120243673) 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, 858574288 + ... + 858574371.

It is an arithmetic number, because the mean of its divisors is an integer number (10302891960).

Almost surely, 2^72120243678 is an apocalyptic number.

72120243678 is an abundant number, since it is smaller than the sum of its proper divisors (92726027682).

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

72120243678 is a wasteful number, since it uses less digits than its factorization.

72120243678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1717148671.

The product of its (nonzero) digits is 225792, while the sum is 42.

The spelling of 72120243678 in words is "seventy-two billion, one hundred twenty million, two hundred forty-three thousand, six hundred seventy-eight".