72847072221 has 16 divisors (see below), whose sum is σ = 121096432128. Its totient is φ = 37842634800.

The previous prime is 72847072211. The next prime is 72847072271. The reversal of 72847072221 is 12227074827.

It is not a de Polignac number, because 72847072221 - 2⁷ = 72847072093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72847072211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 157677415 + ... + 157677876.

It is an arithmetic number, because the mean of its divisors is an integer number (7568527008).

Almost surely, 2^72847072221 is an apocalyptic number.

It is an amenable number.

72847072221 is a deficient number, since it is larger than the sum of its proper divisors (48249359907).

72847072221 is a wasteful number, since it uses less digits than its factorization.

72847072221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315355312.

The product of its (nonzero) digits is 175616, while the sum is 42.

The spelling of 72847072221 in words is "seventy-two billion, eight hundred forty-seven million, seventy-two thousand, two hundred twenty-one".