72011811 has 4 divisors (see below), whose sum is σ = 96015752. Its totient is φ = 48007872.

The previous prime is 72011809. The next prime is 72011833. The reversal of 72011811 is 11811027.

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

It is not a de Polignac number, because 72011811 - 2¹ = 72011809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72011851) 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, 12001966 + ... + 12001971.

It is an arithmetic number, because the mean of its divisors is an integer number (24003938).

Almost surely, 2^72011811 is an apocalyptic number.

72011811 is a deficient number, since it is larger than the sum of its proper divisors (24003941).

72011811 is a wasteful number, since it uses less digits than its factorization.

72011811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24003940.

The product of its (nonzero) digits is 112, while the sum is 21.

The square root of 72011811 is about 8485.9773155483. The cubic root of 72011811 is about 416.0395113944.

Adding to 72011811 its reverse (11811027), we get a palindrome (83822838).

The spelling of 72011811 in words is "seventy-two million, eleven thousand, eight hundred eleven".