72578728069231 has 2 divisors, whose sum is σ = 72578728069232. Its totient is φ = 72578728069230.

The previous prime is 72578728069213. The next prime is 72578728069259. The reversal of 72578728069231 is 13296082787527.

Together with previous prime (72578728069213) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72578728069231 - 2⁴¹ = 70379704813679 is a prime.

It is a super-2 number, since 2×72578728069231² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72578728069201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36289364034615 + 36289364034616.

It is an arithmetic number, because the mean of its divisors is an integer number (36289364034616).

Almost surely, 2^{72578728069231} is an apocalyptic number.

72578728069231 is a deficient number, since it is larger than the sum of its proper divisors (1).

72578728069231 is an equidigital number, since it uses as much as digits as its factorization.

72578728069231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 142248960, while the sum is 67.

The spelling of 72578728069231 in words is "seventy-two trillion, five hundred seventy-eight billion, seven hundred twenty-eight million, sixty-nine thousand, two hundred thirty-one".