82724401 has 4 divisors (see below), whose sum is σ = 82970212. Its totient is φ = 82478592.

The previous prime is 82724393. The next prime is 82724417. The reversal of 82724401 is 10442728.

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 12567025 + 70157376 = 3545^2 + 8376^2 .

It is a cyclic number.

It is not a de Polignac number, because 82724401 - 2³ = 82724393 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 82724401.

It is not an unprimeable number, because it can be changed into a prime (82724471) 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, 122400 + ... + 123073.

It is an arithmetic number, because the mean of its divisors is an integer number (20742553).

Almost surely, 2^82724401 is an apocalyptic number.

It is an amenable number.

82724401 is a deficient number, since it is larger than the sum of its proper divisors (245811).

82724401 is a wasteful number, since it uses less digits than its factorization.

82724401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245810.

The product of its (nonzero) digits is 3584, while the sum is 28.

The square root of 82724401 is about 9095.2955422020. The cubic root of 82724401 is about 435.7237276361.

The spelling of 82724401 in words is "eighty-two million, seven hundred twenty-four thousand, four hundred one".