82072169 has 4 divisors (see below), whose sum is σ = 82377540. Its totient is φ = 81766800.

The previous prime is 82072139. The next prime is 82072171. The reversal of 82072169 is 96127028.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 44089600 + 37982569 = 6640^2 + 6163^2 .

It is a cyclic number.

It is not a de Polignac number, because 82072169 - 2¹² = 82068073 is a prime.

It is a super-2 number, since 2×82072169² = 13471681848729122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82072129) 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, 152282 + ... + 152819.

It is an arithmetic number, because the mean of its divisors is an integer number (20594385).

Almost surely, 2^82072169 is an apocalyptic number.

It is an amenable number.

82072169 is a deficient number, since it is larger than the sum of its proper divisors (305371).

82072169 is a wasteful number, since it uses less digits than its factorization.

82072169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305370.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 82072169 is about 9059.3691281457. The cubic root of 82072169 is about 434.5755652220.

The spelling of 82072169 in words is "eighty-two million, seventy-two thousand, one hundred sixty-nine".