72897811 has 4 divisors (see below), whose sum is σ = 83311792. Its totient is φ = 62483832.

The previous prime is 72897791. The next prime is 72897823. The reversal of 72897811 is 11879827.

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 72897811 - 2¹⁹ = 72373523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72897841) 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, 5206980 + ... + 5206993.

It is an arithmetic number, because the mean of its divisors is an integer number (20827948).

Almost surely, 2^72897811 is an apocalyptic number.

72897811 is a deficient number, since it is larger than the sum of its proper divisors (10413981).

72897811 is a wasteful number, since it uses less digits than its factorization.

72897811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10413980.

The product of its digits is 56448, while the sum is 43.

The square root of 72897811 is about 8538.0214921257. The cubic root of 72897811 is about 417.7388137331.

The spelling of 72897811 in words is "seventy-two million, eight hundred ninety-seven thousand, eight hundred eleven".