72245515 has 4 divisors (see below), whose sum is σ = 86694624. Its totient is φ = 57796408.

The previous prime is 72245501. The next prime is 72245521. The reversal of 72245515 is 51554227.

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

It is a cyclic number.

It is not a de Polignac number, because 72245515 - 2¹⁵ = 72212747 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7224547 + ... + 7224556.

It is an arithmetic number, because the mean of its divisors is an integer number (21673656).

Almost surely, 2^72245515 is an apocalyptic number.

72245515 is a deficient number, since it is larger than the sum of its proper divisors (14449109).

72245515 is a wasteful number, since it uses less digits than its factorization.

72245515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14449108.

The product of its digits is 14000, while the sum is 31.

The square root of 72245515 is about 8499.7361723762. The cubic root of 72245515 is about 416.4890909090.

The spelling of 72245515 in words is "seventy-two million, two hundred forty-five thousand, five hundred fifteen".