82724421 has 16 divisors (see below), whose sum is σ = 119450240. Its totient is φ = 50621760.

The previous prime is 82724419. The next prime is 82724459. The reversal of 82724421 is 12442728.

It is not a de Polignac number, because 82724421 - 2¹ = 82724419 is a prime.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 1200 + ... + 12918.

It is an arithmetic number, because the mean of its divisors is an integer number (7465640).

Almost surely, 2^82724421 is an apocalyptic number.

It is an amenable number.

82724421 is a deficient number, since it is larger than the sum of its proper divisors (36725819).

82724421 is a wasteful number, since it uses less digits than its factorization.

82724421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11916.

The product of its digits is 7168, while the sum is 30.

The square root of 82724421 is about 9095.2966416715. The cubic root of 82724421 is about 435.7237627506.

The spelling of 82724421 in words is "eighty-two million, seven hundred twenty-four thousand, four hundred twenty-one".