72851523 has 4 divisors (see below), whose sum is σ = 97135368. Its totient is φ = 48567680.

The previous prime is 72851501. The next prime is 72851539. The reversal of 72851523 is 32515827.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32515827 = 3 ⋅10838609.

It is a cyclic number.

It is not a de Polignac number, because 72851523 - 2⁹ = 72851011 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72851543) by changing a digit.

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, 12141918 + ... + 12141923.

It is an arithmetic number, because the mean of its divisors is an integer number (24283842).

Almost surely, 2^72851523 is an apocalyptic number.

72851523 is a deficient number, since it is larger than the sum of its proper divisors (24283845).

72851523 is a wasteful number, since it uses less digits than its factorization.

72851523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24283844.

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

The square root of 72851523 is about 8535.3103634256. The cubic root of 72851523 is about 417.6503776605.

The spelling of 72851523 in words is "seventy-two million, eight hundred fifty-one thousand, five hundred twenty-three".