72102193 has 4 divisors (see below), whose sum is σ = 72912420. Its totient is φ = 71291968.

The previous prime is 72102181. The next prime is 72102203. The reversal of 72102193 is 39120127.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39120127 = 59 ⋅663053.

It can be written as a sum of positive squares in 2 ways, for example, as 48608784 + 23493409 = 6972^2 + 4847^2 .

It is a cyclic number.

It is not a de Polignac number, because 72102193 - 2⁹ = 72101681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72102113) 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, 404980 + ... + 405157.

It is an arithmetic number, because the mean of its divisors is an integer number (18228105).

Almost surely, 2^72102193 is an apocalyptic number.

It is an amenable number.

72102193 is a deficient number, since it is larger than the sum of its proper divisors (810227).

72102193 is an equidigital number, since it uses as much as digits as its factorization.

72102193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 810226.

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 72102193 is about 8491.3010192785. The cubic root of 72102193 is about 416.2134956429.

The spelling of 72102193 in words is "seventy-two million, one hundred two thousand, one hundred ninety-three".