72912011 has 4 divisors (see below), whose sum is σ = 73395024. Its totient is φ = 72429000.

The previous prime is 72911999. The next prime is 72912029. The reversal of 72912011 is 11021927.

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 72912011 - 2⁶ = 72911947 is a prime.

It is a super-2 number, since 2×72912011² = 10632322696128242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72912211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 241280 + ... + 241581.

It is an arithmetic number, because the mean of its divisors is an integer number (18348756).

Almost surely, 2^72912011 is an apocalyptic number.

72912011 is a deficient number, since it is larger than the sum of its proper divisors (483013).

72912011 is a wasteful number, since it uses less digits than its factorization.

72912011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 483012.

The product of its (nonzero) digits is 252, while the sum is 23.

The square root of 72912011 is about 8538.8530260217. The cubic root of 72912011 is about 417.7659362029.

Adding to 72912011 its reverse (11021927), we get a palindrome (83933938).

The spelling of 72912011 in words is "seventy-two million, nine hundred twelve thousand, eleven".