72523518 has 16 divisors (see below), whose sum is σ = 147090816. Its totient is φ = 23833880.

The previous prime is 72523511. The next prime is 72523523. The reversal of 72523518 is 81532527.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72523511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84696 + ... + 85547.

It is an arithmetic number, because the mean of its divisors is an integer number (9193176).

Almost surely, 2^72523518 is an apocalyptic number.

72523518 is an abundant number, since it is smaller than the sum of its proper divisors (74567298).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72523518 is a wasteful number, since it uses less digits than its factorization.

72523518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170319.

The product of its digits is 16800, while the sum is 33.

The square root of 72523518 is about 8516.0740954973. The cubic root of 72523518 is about 417.0226281506.

Subtracting 72523518 from its reverse (81532527), we obtain a palindrome (9009009).

The spelling of 72523518 in words is "seventy-two million, five hundred twenty-three thousand, five hundred eighteen".