72821311 has 8 divisors (see below), whose sum is σ = 74894544. Its totient is φ = 70774080.

The previous prime is 72821297. The next prime is 72821327. The reversal of 72821311 is 11312827.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 72821311 - 2⁹ = 72820799 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 (72821011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 750 + ... + 12091.

It is an arithmetic number, because the mean of its divisors is an integer number (9361818).

Almost surely, 2^72821311 is an apocalyptic number.

72821311 is a deficient number, since it is larger than the sum of its proper divisors (2073233).

72821311 is a wasteful number, since it uses less digits than its factorization.

72821311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13001.

The product of its digits is 672, while the sum is 25.

The square root of 72821311 is about 8533.5403555617. The cubic root of 72821311 is about 417.5926355692.

The spelling of 72821311 in words is "seventy-two million, eight hundred twenty-one thousand, three hundred eleven".