72067771 has 4 divisors (see below), whose sum is σ = 72106272. Its totient is φ = 72029272.

The previous prime is 72067759. The next prime is 72067837. The reversal of 72067771 is 17776027.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 72067771 - 2⁵ = 72067739 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 72067771.

It is not an unprimeable number, because it can be changed into a prime (72067711) 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, 16291 + ... + 20236.

It is an arithmetic number, because the mean of its divisors is an integer number (18026568).

Almost surely, 2^72067771 is an apocalyptic number.

72067771 is a deficient number, since it is larger than the sum of its proper divisors (38501).

72067771 is a wasteful number, since it uses less digits than its factorization.

72067771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38500.

The product of its (nonzero) digits is 28812, while the sum is 37.

The square root of 72067771 is about 8489.2738794316. The cubic root of 72067771 is about 416.1472508642.

The spelling of 72067771 in words is "seventy-two million, sixty-seven thousand, seven hundred seventy-one".