72639241 has 4 divisors (see below), whose sum is σ = 72668484. Its totient is φ = 72610000.

The previous prime is 72639239. The next prime is 72639247. The reversal of 72639241 is 14293627.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 14293627 = 281 ⋅50867.

It can be written as a sum of positive squares in 2 ways, for example, as 23232400 + 49406841 = 4820^2 + 7029^2 .

It is a cyclic number.

It is not a de Polignac number, because 72639241 - 2¹ = 72639239 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72639197 and 72639206.

It is not an unprimeable number, because it can be changed into a prime (72639247) 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, 10510 + ... + 15991.

It is an arithmetic number, because the mean of its divisors is an integer number (18167121).

Almost surely, 2^72639241 is an apocalyptic number.

It is an amenable number.

72639241 is a deficient number, since it is larger than the sum of its proper divisors (29243).

72639241 is a wasteful number, since it uses less digits than its factorization.

72639241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29242.

The product of its digits is 18144, while the sum is 34.

The square root of 72639241 is about 8522.8657739049. The cubic root of 72639241 is about 417.2443192896.

The spelling of 72639241 in words is "seventy-two million, six hundred thirty-nine thousand, two hundred forty-one".