72739109 has 2 divisors, whose sum is σ = 72739110. Its totient is φ = 72739108.

The previous prime is 72739081. The next prime is 72739157. The reversal of 72739109 is 90193727.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70930084 + 1809025 = 8422^2 + 1345^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72739109 is a prime.

It is a super-2 number, since 2×72739109² = 10581955956227762, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72732109) 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, 36369554 + 36369555.

It is an arithmetic number, because the mean of its divisors is an integer number (36369555).

Almost surely, 2^72739109 is an apocalyptic number.

It is an amenable number.

72739109 is a deficient number, since it is larger than the sum of its proper divisors (1).

72739109 is an equidigital number, since it uses as much as digits as its factorization.

72739109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23814, while the sum is 38.

The square root of 72739109 is about 8528.7225889930. The cubic root of 72739109 is about 417.4354477270.

The spelling of 72739109 in words is "seventy-two million, seven hundred thirty-nine thousand, one hundred nine".