72109539 has 24 divisors (see below), whose sum is σ = 105788592. Its totient is φ = 47328000.

The previous prime is 72109537. The next prime is 72109553. The reversal of 72109539 is 93590127.

It is not a de Polignac number, because 72109539 - 2¹ = 72109537 is a prime.

It is a super-2 number, since 2×72109539² = 10399571229585042, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (72109537) 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 in 23 ways as a sum of consecutive naturals, for example, 287164 + ... + 287414.

It is an arithmetic number, because the mean of its divisors is an integer number (4407858).

Almost surely, 2^72109539 is an apocalyptic number.

72109539 is a deficient number, since it is larger than the sum of its proper divisors (33679053).

72109539 is a wasteful number, since it uses less digits than its factorization.

72109539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 627 (or 624 counting only the distinct ones).

The product of its (nonzero) digits is 17010, while the sum is 36.

The square root of 72109539 is about 8491.7335685948. The cubic root of 72109539 is about 416.2276302130.

The spelling of 72109539 in words is "seventy-two million, one hundred nine thousand, five hundred thirty-nine".