72168018420 has 24 divisors (see below), whose sum is σ = 202070451744. Its totient is φ = 19244804896.

The previous prime is 72168018389. The next prime is 72168018451. The reversal of 72168018420 is 2481086127.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (72168018389) and next prime (72168018451).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 601400094 + ... + 601400213.

It is an arithmetic number, because the mean of its divisors is an integer number (8419602156).

Almost surely, 2^72168018420 is an apocalyptic number.

It is an amenable number.

72168018420 is an abundant number, since it is smaller than the sum of its proper divisors (129902433324).

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

72168018420 is a wasteful number, since it uses less digits than its factorization.

72168018420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1202800319 (or 1202800317 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 39.

The spelling of 72168018420 in words is "seventy-two billion, one hundred sixty-eight million, eighteen thousand, four hundred twenty".