85639964 has 6 divisors (see below), whose sum is σ = 149869944. Its totient is φ = 42819980.

The previous prime is 85639963. The next prime is 85639979. The reversal of 85639964 is 46993658.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85639963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10704992 + ... + 10704999.

It is an arithmetic number, because the mean of its divisors is an integer number (24978324).

Almost surely, 2^85639964 is an apocalyptic number.

It is an amenable number.

85639964 is a deficient number, since it is larger than the sum of its proper divisors (64229980).

85639964 is a wasteful number, since it uses less digits than its factorization.

85639964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21409995 (or 21409993 counting only the distinct ones).

The product of its digits is 1399680, while the sum is 50.

The square root of 85639964 is about 9254.1862959420. The cubic root of 85639964 is about 440.7836654015.

The spelling of 85639964 in words is "eighty-five million, six hundred thirty-nine thousand, nine hundred sixty-four".