72306145 has 4 divisors (see below), whose sum is σ = 86767380. Its totient is φ = 57844912.

The previous prime is 72306137. The next prime is 72306149. The reversal of 72306145 is 54160327.

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 40755456 + 31550689 = 6384^2 + 5617^2 .

It is a cyclic number.

It is not a de Polignac number, because 72306145 - 2³ = 72306137 is a prime.

It is a super-2 number, since 2×72306145² = 10456357209522050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (72306149) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7230610 + ... + 7230619.

It is an arithmetic number, because the mean of its divisors is an integer number (21691845).

Almost surely, 2^72306145 is an apocalyptic number.

It is an amenable number.

72306145 is a deficient number, since it is larger than the sum of its proper divisors (14461235).

72306145 is a wasteful number, since it uses less digits than its factorization.

72306145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14461234.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 72306145 is about 8503.3020056917. The cubic root of 72306145 is about 416.6055672187.

The spelling of 72306145 in words is "seventy-two million, three hundred six thousand, one hundred forty-five".