72522493 has 4 divisors (see below), whose sum is σ = 76788540. Its totient is φ = 68256448.

The previous prime is 72522491. The next prime is 72522521. The reversal of 72522493 is 39422527.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39422527 = 709 ⋅55603.

It can be written as a sum of positive squares in 2 ways, for example, as 43599609 + 28922884 = 6603^2 + 5378^2 .

It is a cyclic number.

It is not a de Polignac number, because 72522493 - 2¹ = 72522491 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72522491) 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, 2132998 + ... + 2133031.

It is an arithmetic number, because the mean of its divisors is an integer number (19197135).

Almost surely, 2^72522493 is an apocalyptic number.

It is an amenable number.

72522493 is a deficient number, since it is larger than the sum of its proper divisors (4266047).

72522493 is a wasteful number, since it uses less digits than its factorization.

72522493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4266046.

The product of its digits is 30240, while the sum is 34.

The square root of 72522493 is about 8516.0139149722. The cubic root of 72522493 is about 417.0206634996.

Adding to 72522493 its sum of digits (34), we get a palindrome (72522527).

The spelling of 72522493 in words is "seventy-two million, five hundred twenty-two thousand, four hundred ninety-three".