72166093 has 4 divisors (see below), whose sum is σ = 73035648. Its totient is φ = 71296540.

The previous prime is 72166091. The next prime is 72166117. The reversal of 72166093 is 39066127.

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.

It is a cyclic number.

It is not a de Polignac number, because 72166093 - 2¹ = 72166091 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72166091) 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, 434653 + ... + 434818.

It is an arithmetic number, because the mean of its divisors is an integer number (18258912).

Almost surely, 2^72166093 is an apocalyptic number.

It is an amenable number.

72166093 is a deficient number, since it is larger than the sum of its proper divisors (869555).

72166093 is an equidigital number, since it uses as much as digits as its factorization.

72166093 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 869554.

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 72166093 is about 8495.0628602736. The cubic root of 72166093 is about 416.3364146476.

Adding to 72166093 its sum of digits (34), we get a palindrome (72166127).

The spelling of 72166093 in words is "seventy-two million, one hundred sixty-six thousand, ninety-three".