85639424 has 36 divisors (see below), whose sum is σ = 184101036. Its totient is φ = 39524352.

The previous prime is 85639409. The next prime is 85639427. The reversal of 85639424 is 42493658.

It can be written as a sum of positive squares in 2 ways, for example, as 8761600 + 76877824 = 2960^2 + 8768^2 .

It is a super-2 number, since 2×85639424² = 14668221886103552, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (85639427) 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, 9539 + ... + 16194.

Almost surely, 2^85639424 is an apocalyptic number.

It is an amenable number.

85639424 is an abundant number, since it is smaller than the sum of its proper divisors (98461612).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

85639424 is a wasteful number, since it uses less digits than its factorization.

85639424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25762 (or 25748 counting only the distinct ones).

The product of its digits is 207360, while the sum is 41.

The square root of 85639424 is about 9254.1571199110. The cubic root of 85639424 is about 440.7827389506.

The spelling of 85639424 in words is "eighty-five million, six hundred thirty-nine thousand, four hundred twenty-four".