82639949 has 8 divisors (see below), whose sum is σ = 99416640. Its totient is φ = 67106016.

The previous prime is 82639919. The next prime is 82639957. The reversal of 82639949 is 94993628.

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 82639949 - 2⁸ = 82639693 is a prime.

It is a super-2 number, since 2×82639949² = 13658722341445202, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 82639897 and 82639906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82639919) 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, 310544 + ... + 310809.

It is an arithmetic number, because the mean of its divisors is an integer number (12427080).

Almost surely, 2^82639949 is an apocalyptic number.

It is an amenable number.

82639949 is a deficient number, since it is larger than the sum of its proper divisors (16776691).

82639949 is a wasteful number, since it uses less digits than its factorization.

82639949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 621379.

The product of its digits is 839808, while the sum is 50.

The square root of 82639949 is about 9090.6517368118. The cubic root of 82639949 is about 435.5754027203.

The spelling of 82639949 in words is "eighty-two million, six hundred thirty-nine thousand, nine hundred forty-nine".