72523569 has 4 divisors (see below), whose sum is σ = 96698096. Its totient is φ = 48349044.

The previous prime is 72523559. The next prime is 72523579. The reversal of 72523569 is 96532527.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (72523559) and next prime (72523579).

It is not a de Polignac number, because 72523569 - 2⁵ = 72523537 is a prime.

It is a super-2 number, since 2×72523569² = 10519336120995522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72523559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12087259 + ... + 12087264.

It is an arithmetic number, because the mean of its divisors is an integer number (24174524).

Almost surely, 2^72523569 is an apocalyptic number.

It is an amenable number.

72523569 is a deficient number, since it is larger than the sum of its proper divisors (24174527).

72523569 is a wasteful number, since it uses less digits than its factorization.

72523569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24174526.

The product of its digits is 113400, while the sum is 39.

The square root of 72523569 is about 8516.0770898343. The cubic root of 72523569 is about 417.0227259035.

The spelling of 72523569 in words is "seventy-two million, five hundred twenty-three thousand, five hundred sixty-nine".