827720639 has 8 divisors (see below), whose sum is σ = 857705520. Its totient is φ = 797832000.

The previous prime is 827720629. The next prime is 827720653. The reversal of 827720639 is 936027728.

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 827720639 - 2¹² = 827716543 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 827720639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (827720609) 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, 6317 + ... + 41174.

It is an arithmetic number, because the mean of its divisors is an integer number (107213190).

Almost surely, 2^827720639 is an apocalyptic number.

827720639 is a deficient number, since it is larger than the sum of its proper divisors (29984881).

827720639 is a wasteful number, since it uses less digits than its factorization.

827720639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48121.

The product of its (nonzero) digits is 254016, while the sum is 44.

The square root of 827720639 is about 28770.1344974263. The cubic root of 827720639 is about 938.9185688447.

The spelling of 827720639 in words is "eight hundred twenty-seven million, seven hundred twenty thousand, six hundred thirty-nine".