82720469 has 8 divisors (see below), whose sum is σ = 89600952. Its totient is φ = 75913920.

The previous prime is 82720387. The next prime is 82720481. The reversal of 82720469 is 96402728.

It can be written as a sum of positive squares in 4 ways, for example, as 600625 + 82119844 = 775^2 + 9062^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 82720469 - 2²⁴ = 65943253 is a prime.

It is a super-2 number, since 2×82720469² = 13685351983159922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82720069) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16142 + ... + 20639.

It is an arithmetic number, because the mean of its divisors is an integer number (11200119).

Almost surely, 2^82720469 is an apocalyptic number.

It is an amenable number.

82720469 is a deficient number, since it is larger than the sum of its proper divisors (6880483).

82720469 is a wasteful number, since it uses less digits than its factorization.

82720469 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36967.

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 82720469 is about 9095.0793839306. The cubic root of 82720469 is about 435.7168240187.

The spelling of 82720469 in words is "eighty-two million, seven hundred twenty thousand, four hundred sixty-nine".