72102811 has 12 divisors (see below), whose sum is σ = 79720200. Its totient is φ = 65162240.

The previous prime is 72102809. The next prime is 72102839. The reversal of 72102811 is 11820127.

It is not a de Polignac number, because 72102811 - 2¹ = 72102809 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 (72102851) 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 11 ways as a sum of consecutive naturals, for example, 19995 + ... + 23323.

It is an arithmetic number, because the mean of its divisors is an integer number (6643350).

Almost surely, 2^72102811 is an apocalyptic number.

72102811 is a deficient number, since it is larger than the sum of its proper divisors (7617389).

72102811 is a wasteful number, since it uses less digits than its factorization.

72102811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3530 (or 3519 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 22.

The square root of 72102811 is about 8491.3374093838. The cubic root of 72102811 is about 416.2146847848.

Adding to 72102811 its reverse (11820127), we get a palindrome (83922938).

The spelling of 72102811 in words is "seventy-two million, one hundred two thousand, eight hundred eleven".