72281311 has 4 divisors (see below), whose sum is σ = 74773800. Its totient is φ = 69788824.

The previous prime is 72281309. The next prime is 72281327. The reversal of 72281311 is 11318227.

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 72281311 - 2¹ = 72281309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72281351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1246201 + ... + 1246258.

It is an arithmetic number, because the mean of its divisors is an integer number (18693450).

Almost surely, 2^72281311 is an apocalyptic number.

72281311 is a deficient number, since it is larger than the sum of its proper divisors (2492489).

72281311 is a wasteful number, since it uses less digits than its factorization.

72281311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2492488.

The product of its digits is 672, while the sum is 25.

The square root of 72281311 is about 8501.8416240248. The cubic root of 72281311 is about 416.5578664903.

Adding to 72281311 its reverse (11318227), we get a palindrome (83599538).

The spelling of 72281311 in words is "seventy-two million, two hundred eighty-one thousand, three hundred eleven".