85207639 has 16 divisors (see below), whose sum is σ = 95825664. Its totient is φ = 75096000.

The previous prime is 85207637. The next prime is 85207673. The reversal of 85207639 is 93670258.

It is a cyclic number.

It is not a de Polignac number, because 85207639 - 2¹ = 85207637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85207637) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70827 + ... + 72019.

It is an arithmetic number, because the mean of its divisors is an integer number (5989104).

Almost surely, 2^85207639 is an apocalyptic number.

85207639 is a deficient number, since it is larger than the sum of its proper divisors (10618025).

85207639 is a wasteful number, since it uses less digits than its factorization.

85207639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1398.

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 85207639 is about 9230.7983945052. The cubic root of 85207639 is about 440.0406969933.

The spelling of 85207639 in words is "eighty-five million, two hundred seven thousand, six hundred thirty-nine".