72711787 has 4 divisors (see below), whose sum is σ = 75219120. Its totient is φ = 70204456.

The previous prime is 72711781. The next prime is 72711799. The reversal of 72711787 is 78711727.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78711727 = 23 ⋅3422249.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72711787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72711781) 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, 1253623 + ... + 1253680.

It is an arithmetic number, because the mean of its divisors is an integer number (18804780).

Almost surely, 2^72711787 is an apocalyptic number.

72711787 is a deficient number, since it is larger than the sum of its proper divisors (2507333).

72711787 is a wasteful number, since it uses less digits than its factorization.

72711787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2507332.

The product of its digits is 38416, while the sum is 40.

The square root of 72711787 is about 8527.1206746475. The cubic root of 72711787 is about 417.3831759861.

The spelling of 72711787 in words is "seventy-two million, seven hundred eleven thousand, seven hundred eighty-seven".