72728311 has 2 divisors, whose sum is σ = 72728312. Its totient is φ = 72728310.

The previous prime is 72728309. The next prime is 72728321. The reversal of 72728311 is 11382727.

It is a weak prime.

It is an emirp because it is prime and its reverse (11382727) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72728311 - 2¹ = 72728309 is a prime.

Together with 72728309, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72728321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36364155 + 36364156.

It is an arithmetic number, because the mean of its divisors is an integer number (36364156).

Almost surely, 2^72728311 is an apocalyptic number.

72728311 is a deficient number, since it is larger than the sum of its proper divisors (1).

72728311 is an equidigital number, since it uses as much as digits as its factorization.

72728311 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4704, while the sum is 31.

The square root of 72728311 is about 8528.0895281417. The cubic root of 72728311 is about 417.4147908384.

The spelling of 72728311 in words is "seventy-two million, seven hundred twenty-eight thousand, three hundred eleven".