72644237 has 4 divisors (see below), whose sum is σ = 72801600. Its totient is φ = 72486876.

The previous prime is 72644233. The next prime is 72644269. The reversal of 72644237 is 73244627.

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, and also an emirpimes, since its reverse is a distinct semiprime: 73244627 = 23 ⋅3184549.

It is a cyclic number.

It is not a de Polignac number, because 72644237 - 2² = 72644233 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72644197 and 72644206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72644233) 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, 77987 + ... + 78912.

It is an arithmetic number, because the mean of its divisors is an integer number (18200400).

Almost surely, 2^72644237 is an apocalyptic number.

It is an amenable number.

72644237 is a deficient number, since it is larger than the sum of its proper divisors (157363).

72644237 is a wasteful number, since it uses less digits than its factorization.

72644237 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157362.

The product of its digits is 56448, while the sum is 35.

The square root of 72644237 is about 8523.1588627691. The cubic root of 72644237 is about 417.2538848485.

The spelling of 72644237 in words is "seventy-two million, six hundred forty-four thousand, two hundred thirty-seven".