72120005 has 4 divisors (see below), whose sum is σ = 86544012. Its totient is φ = 57696000.

The previous prime is 72119977. The next prime is 72120031. The reversal of 72120005 is 50002127.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7365796 + 64754209 = 2714^2 + 8047^2 .

It is not a de Polignac number, because 72120005 - 2⁶ = 72119941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 7211996 + ... + 7212005.

It is an arithmetic number, because the mean of its divisors is an integer number (21636003).

Almost surely, 2^72120005 is an apocalyptic number.

It is an amenable number.

72120005 is a deficient number, since it is larger than the sum of its proper divisors (14424007).

72120005 is a wasteful number, since it uses less digits than its factorization.

72120005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14424006.

The product of its (nonzero) digits is 140, while the sum is 17.

The square root of 72120005 is about 8492.3497926075. The cubic root of 72120005 is about 416.2477663730.

The spelling of 72120005 in words is "seventy-two million, one hundred twenty thousand, five".