85768521 has 4 divisors (see below), whose sum is σ = 114358032. Its totient is φ = 57179012.

The previous prime is 85768447. The next prime is 85768547. The reversal of 85768521 is 12586758.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 85768521 - 2⁷ = 85768393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (85768591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14294751 + ... + 14294756.

It is an arithmetic number, because the mean of its divisors is an integer number (28589508).

Almost surely, 2^85768521 is an apocalyptic number.

It is an amenable number.

85768521 is a deficient number, since it is larger than the sum of its proper divisors (28589511).

85768521 is a wasteful number, since it uses less digits than its factorization.

85768521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28589510.

The product of its digits is 134400, while the sum is 42.

The square root of 85768521 is about 9261.1295747333. The cubic root of 85768521 is about 441.0041134740.

It can be divided in two parts, 857 and 68521, that added together give a triangular number (69378 = T₃₇₂).

The spelling of 85768521 in words is "eighty-five million, seven hundred sixty-eight thousand, five hundred twenty-one".