82815719 has 4 divisors (see below), whose sum is σ = 94646544. Its totient is φ = 70984896.

The previous prime is 82815713. The next prime is 82815743. The reversal of 82815719 is 91751828.

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

It is a cyclic number.

It is not a de Polignac number, because 82815719 - 2¹² = 82811623 is a prime.

It is a super-2 number, since 2×82815719² = 13716886626973922, 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 (82815713) 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, 5915402 + ... + 5915415.

It is an arithmetic number, because the mean of its divisors is an integer number (23661636).

Almost surely, 2^82815719 is an apocalyptic number.

82815719 is a deficient number, since it is larger than the sum of its proper divisors (11830825).

82815719 is a wasteful number, since it uses less digits than its factorization.

82815719 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11830824.

The product of its digits is 40320, while the sum is 41.

The square root of 82815719 is about 9100.3142253441. The cubic root of 82815719 is about 435.8839979107.

The spelling of 82815719 in words is "eighty-two million, eight hundred fifteen thousand, seven hundred nineteen".