85782639 has 4 divisors (see below), whose sum is σ = 114376856. Its totient is φ = 57188424.

The previous prime is 85782589. The next prime is 85782659. The reversal of 85782639 is 93628758.

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

It is not a de Polignac number, because 85782639 - 2¹⁵ = 85749871 is a prime.

It is a super-2 number, since 2×85782639² = 14717322307608642, 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 (85782659) 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, 14297104 + ... + 14297109.

It is an arithmetic number, because the mean of its divisors is an integer number (28594214).

Almost surely, 2^85782639 is an apocalyptic number.

85782639 is a deficient number, since it is larger than the sum of its proper divisors (28594217).

85782639 is a wasteful number, since it uses less digits than its factorization.

85782639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28594216.

The product of its digits is 725760, while the sum is 48.

The square root of 85782639 is about 9261.8917614060. The cubic root of 85782639 is about 441.0283094316.

The spelling of 85782639 in words is "eighty-five million, seven hundred eighty-two thousand, six hundred thirty-nine".