72700757 has 2 divisors, whose sum is σ = 72700758. Its totient is φ = 72700756.

The previous prime is 72700717. The next prime is 72700759. The reversal of 72700757 is 75700727.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63856081 + 8844676 = 7991^2 + 2974^2 .

It is an emirp because it is prime and its reverse (75700727) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72700757 - 2⁸ = 72700501 is a prime.

Together with 72700759, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72700759) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36350378 + 36350379.

It is an arithmetic number, because the mean of its divisors is an integer number (36350379).

Almost surely, 2^72700757 is an apocalyptic number.

It is an amenable number.

72700757 is a deficient number, since it is larger than the sum of its proper divisors (1).

72700757 is an equidigital number, since it uses as much as digits as its factorization.

72700757 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24010, while the sum is 35.

The square root of 72700757 is about 8526.4738901846. The cubic root of 72700757 is about 417.3620699663.

The spelling of 72700757 in words is "seventy-two million, seven hundred thousand, seven hundred fifty-seven".