85669639 has 4 divisors (see below), whose sum is σ = 93457800. Its totient is φ = 77881480.

The previous prime is 85669627. The next prime is 85669643. The reversal of 85669639 is 93696658.

It is a happy number.

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 85669639 - 2⁹ = 85669127 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85669679) 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, 3894064 + ... + 3894085.

It is an arithmetic number, because the mean of its divisors is an integer number (23364450).

Almost surely, 2^85669639 is an apocalyptic number.

85669639 is a deficient number, since it is larger than the sum of its proper divisors (7788161).

85669639 is a wasteful number, since it uses less digits than its factorization.

85669639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7788160.

The product of its digits is 2099520, while the sum is 52.

The square root of 85669639 is about 9255.7894855058. The cubic root of 85669639 is about 440.8345713265.

The spelling of 85669639 in words is "eighty-five million, six hundred sixty-nine thousand, six hundred thirty-nine".