72075505 has 4 divisors (see below), whose sum is σ = 86490612. Its totient is φ = 57660400.

The previous prime is 72075401. The next prime is 72075511. The reversal of 72075505 is 50557027.

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 16900321 + 55175184 = 4111^2 + 7428^2 .

It is a de Polignac number, because none of the positive numbers 2^k-72075505 is a prime.

It is a Duffinian 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, 7207546 + ... + 7207555.

It is an arithmetic number, because the mean of its divisors is an integer number (21622653).

Almost surely, 2^72075505 is an apocalyptic number.

It is an amenable number.

72075505 is a deficient number, since it is larger than the sum of its proper divisors (14415107).

72075505 is a wasteful number, since it uses less digits than its factorization.

72075505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14415106.

The product of its (nonzero) digits is 12250, while the sum is 31.

The square root of 72075505 is about 8489.7293832018. The cubic root of 72075505 is about 416.1621367032.

The spelling of 72075505 in words is "seventy-two million, seventy-five thousand, five hundred five".