72535431 has 4 divisors (see below), whose sum is σ = 96713912. Its totient is φ = 48356952.

The previous prime is 72535427. The next prime is 72535439. The reversal of 72535431 is 13453527.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13453527 = 3 ⋅4484509.

It is not a de Polignac number, because 72535431 - 2² = 72535427 is a prime.

It is a super-2 number, since 2×72535431² = 10522777500711522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72535439) 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, 12089236 + ... + 12089241.

It is an arithmetic number, because the mean of its divisors is an integer number (24178478).

Almost surely, 2^72535431 is an apocalyptic number.

72535431 is a deficient number, since it is larger than the sum of its proper divisors (24178481).

72535431 is a wasteful number, since it uses less digits than its factorization.

72535431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24178480.

The product of its digits is 12600, while the sum is 30.

The square root of 72535431 is about 8516.7735087884. The cubic root of 72535431 is about 417.0454608294.

Adding to 72535431 its reverse (13453527), we get a palindrome (85988958).

The spelling of 72535431 in words is "seventy-two million, five hundred thirty-five thousand, four hundred thirty-one".