72136577 has 2 divisors, whose sum is σ = 72136578. Its totient is φ = 72136576.

The previous prime is 72136553. The next prime is 72136607. The reversal of 72136577 is 77563127.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39828721 + 32307856 = 6311^2 + 5684^2 .

It is a cyclic number.

It is not a de Polignac number, because 72136577 - 2¹⁸ = 71874433 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72136577.

It is not a weakly prime, because it can be changed into another prime (72136517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36068288 + 36068289.

It is an arithmetic number, because the mean of its divisors is an integer number (36068289).

Almost surely, 2^72136577 is an apocalyptic number.

It is an amenable number.

72136577 is a deficient number, since it is larger than the sum of its proper divisors (1).

72136577 is an equidigital number, since it uses as much as digits as its factorization.

72136577 is an evil number, because the sum of its binary digits is even.

The product of its digits is 61740, while the sum is 38.

The square root of 72136577 is about 8493.3254382486. The cubic root of 72136577 is about 416.2796462455.

The spelling of 72136577 in words is "seventy-two million, one hundred thirty-six thousand, five hundred seventy-seven".