72663541 has 4 divisors (see below), whose sum is σ = 73383084. Its totient is φ = 71944000.

The previous prime is 72663533. The next prime is 72663553. The reversal of 72663541 is 14536627.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 42523441 + 30140100 = 6521^2 + 5490^2 .

It is a cyclic number.

It is not a de Polignac number, because 72663541 - 2³ = 72663533 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72663497 and 72663506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72663511) 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, 359620 + ... + 359821.

It is an arithmetic number, because the mean of its divisors is an integer number (18345771).

Almost surely, 2^72663541 is an apocalyptic number.

It is an amenable number.

72663541 is a deficient number, since it is larger than the sum of its proper divisors (719543).

72663541 is a wasteful number, since it uses less digits than its factorization.

72663541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 719542.

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

The square root of 72663541 is about 8524.2912315336. The cubic root of 72663541 is about 417.2908410062.

The spelling of 72663541 in words is "seventy-two million, six hundred sixty-three thousand, five hundred forty-one".