72302161 has 4 divisors (see below), whose sum is σ = 72830052. Its totient is φ = 71774272.

The previous prime is 72302159. The next prime is 72302177. The reversal of 72302161 is 16120327.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16120327 = 443 ⋅36389.

It can be written as a sum of positive squares in 2 ways, for example, as 22515025 + 49787136 = 4745^2 + 7056^2 .

It is a cyclic number.

It is not a de Polignac number, because 72302161 - 2¹ = 72302159 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72302561) 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, 263740 + ... + 264013.

It is an arithmetic number, because the mean of its divisors is an integer number (18207513).

Almost surely, 2^72302161 is an apocalyptic number.

It is an amenable number.

72302161 is a deficient number, since it is larger than the sum of its proper divisors (527891).

72302161 is a wasteful number, since it uses less digits than its factorization.

72302161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 527890.

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 72302161 is about 8503.0677405275. The cubic root of 72302161 is about 416.5979155543.

Adding to 72302161 its reverse (16120327), we get a palindrome (88422488).

The spelling of 72302161 in words is "seventy-two million, three hundred two thousand, one hundred sixty-one".