72166627 has 4 divisors (see below), whose sum is σ = 77717920. Its totient is φ = 66615336.

The previous prime is 72166603. The next prime is 72166637. The reversal of 72166627 is 72666127.

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 72166627 - 2²³ = 63778019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72166637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2775627 + ... + 2775652.

It is an arithmetic number, because the mean of its divisors is an integer number (19429480).

Almost surely, 2^72166627 is an apocalyptic number.

72166627 is a deficient number, since it is larger than the sum of its proper divisors (5551293).

72166627 is a wasteful number, since it uses less digits than its factorization.

72166627 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5551292.

The product of its digits is 42336, while the sum is 37.

The square root of 72166627 is about 8495.0942902360. The cubic root of 72166627 is about 416.3374415523.

Subtracting 72166627 from its reverse (72666127), we obtain a triangular number (499500 = T₉₉₉).

The spelling of 72166627 in words is "seventy-two million, one hundred sixty-six thousand, six hundred twenty-seven".