72648109 has 2 divisors, whose sum is σ = 72648110. Its totient is φ = 72648108.

The previous prime is 72648083. The next prime is 72648127. The reversal of 72648109 is 90184627.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72505225 + 142884 = 8515^2 + 378^2 .

It is a cyclic number.

It is not a de Polignac number, because 72648109 - 2¹⁵ = 72615341 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72648179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36324054 + 36324055.

It is an arithmetic number, because the mean of its divisors is an integer number (36324055).

Almost surely, 2^72648109 is an apocalyptic number.

It is an amenable number.

72648109 is a deficient number, since it is larger than the sum of its proper divisors (1).

72648109 is an equidigital number, since it uses as much as digits as its factorization.

72648109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 72648109 is about 8523.3860055731. The cubic root of 72648109 is about 417.2612980465.

The spelling of 72648109 in words is "seventy-two million, six hundred forty-eight thousand, one hundred nine".