72215425 has 6 divisors (see below), whose sum is σ = 89547158. Its totient is φ = 57772320.

The previous prime is 72215369. The next prime is 72215431. The reversal of 72215425 is 52451227.

It can be written as a sum of positive squares in 3 ways, for example, as 237169 + 71978256 = 487^2 + 8484^2 .

It is not a de Polignac number, because 72215425 - 2¹¹ = 72213377 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72215393 and 72215402.

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 5 ways as a sum of consecutive naturals, for example, 1444284 + ... + 1444333.

Almost surely, 2^72215425 is an apocalyptic number.

It is an amenable number.

72215425 is a deficient number, since it is larger than the sum of its proper divisors (17331733).

72215425 is a wasteful number, since it uses less digits than its factorization.

72215425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2888627 (or 2888622 counting only the distinct ones).

The product of its digits is 5600, while the sum is 28.

The square root of 72215425 is about 8497.9659330925. The cubic root of 72215425 is about 416.4312608046.

The spelling of 72215425 in words is "seventy-two million, two hundred fifteen thousand, four hundred twenty-five".