72333331 has 4 divisors (see below), whose sum is σ = 82666672. Its totient is φ = 61999992.

The previous prime is 72333319. The next prime is 72333341. The reversal of 72333331 is 13333327.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13333327 = 7 ⋅1904761.

It is a cyclic number.

It is not a de Polignac number, because 72333331 - 2⁵ = 72333299 is a prime.

It is a super-2 number, since 2×72333331² = 10464221547111122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72333296 and 72333305.

It is not an unprimeable number, because it can be changed into a prime (72333341) 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, 5166660 + ... + 5166673.

It is an arithmetic number, because the mean of its divisors is an integer number (20666668).

Almost surely, 2^72333331 is an apocalyptic number.

72333331 is a deficient number, since it is larger than the sum of its proper divisors (10333341).

72333331 is a wasteful number, since it uses less digits than its factorization.

72333331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10333340.

The product of its digits is 3402, while the sum is 25.

The square root of 72333331 is about 8504.9004109396. The cubic root of 72333331 is about 416.6577731080.

Adding to 72333331 its reverse (13333327), we get a palindrome (85666658).

The spelling of 72333331 in words is "seventy-two million, three hundred thirty-three thousand, three hundred thirty-one".