72866443 has 4 divisors (see below), whose sum is σ = 78471568. Its totient is φ = 67261320.

The previous prime is 72866429. The next prime is 72866459. The reversal of 72866443 is 34466827.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 72866443 - 2⁵ = 72866411 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72866396 and 72866405.

It is not an unprimeable number, because it can be changed into a prime (72866243) 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, 2802543 + ... + 2802568.

It is an arithmetic number, because the mean of its divisors is an integer number (19617892).

Almost surely, 2^72866443 is an apocalyptic number.

72866443 is a deficient number, since it is larger than the sum of its proper divisors (5605125).

72866443 is a wasteful number, since it uses less digits than its factorization.

72866443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5605124.

The product of its digits is 193536, while the sum is 40.

The square root of 72866443 is about 8536.1843349356. The cubic root of 72866443 is about 417.6788873289.

The spelling of 72866443 in words is "seventy-two million, eight hundred sixty-six thousand, four hundred forty-three".