82420513 has 4 divisors (see below), whose sum is σ = 94194880. Its totient is φ = 70646148.

The previous prime is 82420501. The next prime is 82420543. The reversal of 82420513 is 31502428.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82420513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82420543) 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, 5887173 + ... + 5887186.

It is an arithmetic number, because the mean of its divisors is an integer number (23548720).

Almost surely, 2^82420513 is an apocalyptic number.

It is an amenable number.

82420513 is a deficient number, since it is larger than the sum of its proper divisors (11774367).

82420513 is a wasteful number, since it uses less digits than its factorization.

82420513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11774366.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 82420513 is about 9078.5743924914. The cubic root of 82420513 is about 435.1895294240.

The spelling of 82420513 in words is "eighty-two million, four hundred twenty thousand, five hundred thirteen".