72509711 has 2 divisors, whose sum is σ = 72509712. Its totient is φ = 72509710.

The previous prime is 72509707. The next prime is 72509729. The reversal of 72509711 is 11790527.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72509711 - 2² = 72509707 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72509741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36254855 + 36254856.

It is an arithmetic number, because the mean of its divisors is an integer number (36254856).

Almost surely, 2^72509711 is an apocalyptic number.

72509711 is a deficient number, since it is larger than the sum of its proper divisors (1).

72509711 is an equidigital number, since it uses as much as digits as its factorization.

72509711 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4410, while the sum is 32.

The square root of 72509711 is about 8515.2634134242. The cubic root of 72509711 is about 416.9961622675.

It can be divided in two parts, 7250 and 9711, that added together give a palindrome (16961).

The spelling of 72509711 in words is "seventy-two million, five hundred nine thousand, seven hundred eleven".