85720539 has 4 divisors (see below), whose sum is σ = 114294056. Its totient is φ = 57147024.

The previous prime is 85720519. The next prime is 85720553. The reversal of 85720539 is 93502758.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 85720539 - 2⁵ = 85720507 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 85720497 and 85720506.

It is not an unprimeable number, because it can be changed into a prime (85720519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14286754 + ... + 14286759.

It is an arithmetic number, because the mean of its divisors is an integer number (28573514).

Almost surely, 2^85720539 is an apocalyptic number.

85720539 is a deficient number, since it is larger than the sum of its proper divisors (28573517).

85720539 is a wasteful number, since it uses less digits than its factorization.

85720539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28573516.

The product of its (nonzero) digits is 75600, while the sum is 39.

The square root of 85720539 is about 9258.5387075931. The cubic root of 85720539 is about 440.9218602717.

The spelling of 85720539 in words is "eighty-five million, seven hundred twenty thousand, five hundred thirty-nine".