72523145 has 16 divisors (see below), whose sum is σ = 90729408. Its totient is φ = 55598400.

The previous prime is 72523141. The next prime is 72523147. The reversal of 72523145 is 54132527.

It is a happy number.

It is not a de Polignac number, because 72523145 - 2² = 72523141 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72523141) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9470 + ... + 15320.

It is an arithmetic number, because the mean of its divisors is an integer number (5670588).

Almost surely, 2^72523145 is an apocalyptic number.

It is an amenable number.

72523145 is a deficient number, since it is larger than the sum of its proper divisors (18206263).

72523145 is a wasteful number, since it uses less digits than its factorization.

72523145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5960.

The product of its digits is 8400, while the sum is 29.

The square root of 72523145 is about 8516.0521957066. The cubic root of 72523145 is about 417.0219132114.

The spelling of 72523145 in words is "seventy-two million, five hundred twenty-three thousand, one hundred forty-five".