72711857 has 4 divisors (see below), whose sum is σ = 72817776. Its totient is φ = 72605940.

The previous prime is 72711811. The next prime is 72711871. The reversal of 72711857 is 75811727.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75811727 = 1993 ⋅38039.

It is a cyclic number.

It is not a de Polignac number, because 72711857 - 2¹⁴ = 72695473 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72711857.

It is not an unprimeable number, because it can be changed into a prime (72711557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51923 + ... + 53304.

It is an arithmetic number, because the mean of its divisors is an integer number (18204444).

Almost surely, 2^72711857 is an apocalyptic number.

It is an amenable number.

72711857 is a deficient number, since it is larger than the sum of its proper divisors (105919).

72711857 is a wasteful number, since it uses less digits than its factorization.

72711857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105918.

The product of its digits is 27440, while the sum is 38.

The square root of 72711857 is about 8527.1247791973. The cubic root of 72711857 is about 417.3833099250.

The spelling of 72711857 in words is "seventy-two million, seven hundred eleven thousand, eight hundred fifty-seven".