72120605 has 8 divisors (see below), whose sum is σ = 87963864. Its totient is φ = 56750400.

The previous prime is 72120577. The next prime is 72120641. The reversal of 72120605 is 50602127.

It can be written as a sum of positive squares in 4 ways, for example, as 3247204 + 68873401 = 1802^2 + 8299^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 72120605 - 2¹⁶ = 72055069 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 7 ways as a sum of consecutive naturals, for example, 117926 + ... + 118535.

It is an arithmetic number, because the mean of its divisors is an integer number (10995483).

Almost surely, 2^72120605 is an apocalyptic number.

It is an amenable number.

72120605 is a deficient number, since it is larger than the sum of its proper divisors (15843259).

72120605 is a wasteful number, since it uses less digits than its factorization.

72120605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236527.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 72120605 is about 8492.3851184458. The cubic root of 72120605 is about 416.2489206897.

The spelling of 72120605 in words is "seventy-two million, one hundred twenty thousand, six hundred five".