85638543 has 4 divisors (see below), whose sum is σ = 114184728. Its totient is φ = 57092360.

The previous prime is 85638533. The next prime is 85638547. The reversal of 85638543 is 34583658.

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 85638543 - 2¹² = 85634447 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 85638495 and 85638504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85638547) 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, 14273088 + ... + 14273093.

It is an arithmetic number, because the mean of its divisors is an integer number (28546182).

Almost surely, 2^85638543 is an apocalyptic number.

85638543 is a deficient number, since it is larger than the sum of its proper divisors (28546185).

85638543 is a wasteful number, since it uses less digits than its factorization.

85638543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28546184.

The product of its digits is 345600, while the sum is 42.

The square root of 85638543 is about 9254.1095195594. The cubic root of 85638543 is about 440.7812274546.

The spelling of 85638543 in words is "eighty-five million, six hundred thirty-eight thousand, five hundred forty-three".