72665841 has 4 divisors (see below), whose sum is σ = 96887792. Its totient is φ = 48443892.

The previous prime is 72665839. The next prime is 72665843. The reversal of 72665841 is 14856627.

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: 14856627 = 3 ⋅4952209.

It is an interprime number because it is at equal distance from previous prime (72665839) and next prime (72665843).

It is not a de Polignac number, because 72665841 - 2¹ = 72665839 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72665841.

It is not an unprimeable number, because it can be changed into a prime (72665843) 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, 12110971 + ... + 12110976.

It is an arithmetic number, because the mean of its divisors is an integer number (24221948).

Almost surely, 2^72665841 is an apocalyptic number.

It is an amenable number.

72665841 is a deficient number, since it is larger than the sum of its proper divisors (24221951).

72665841 is a wasteful number, since it uses less digits than its factorization.

72665841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24221950.

The product of its digits is 80640, while the sum is 39.

The square root of 72665841 is about 8524.4261390430. The cubic root of 72665841 is about 417.2952437589.

The spelling of 72665841 in words is "seventy-two million, six hundred sixty-five thousand, eight hundred forty-one".