72071605 has 4 divisors (see below), whose sum is σ = 86485932. Its totient is φ = 57657280.

The previous prime is 72071599. The next prime is 72071647. The reversal of 72071605 is 50617027.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50617027 = 401 ⋅126227.

It can be written as a sum of positive squares in 2 ways, for example, as 27636049 + 44435556 = 5257^2 + 6666^2 .

It is not a de Polignac number, because 72071605 - 2²⁵ = 38517173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7207156 + ... + 7207165.

It is an arithmetic number, because the mean of its divisors is an integer number (21621483).

Almost surely, 2^72071605 is an apocalyptic number.

It is an amenable number.

72071605 is a deficient number, since it is larger than the sum of its proper divisors (14414327).

72071605 is a wasteful number, since it uses less digits than its factorization.

72071605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14414326.

The product of its (nonzero) digits is 2940, while the sum is 28.

The square root of 72071605 is about 8489.4996907945. The cubic root of 72071605 is about 416.1546304008.

The spelling of 72071605 in words is "seventy-two million, seventy-one thousand, six hundred five".