85728319 has 4 divisors (see below), whose sum is σ = 85748544. Its totient is φ = 85708096.

The previous prime is 85728317. The next prime is 85728347. The reversal of 85728319 is 91382758.

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 85728319 - 2¹ = 85728317 is a prime.

It is a super-2 number, since 2×85728319² = 14698689357131522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85728317) 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, 1042 + ... + 13135.

It is an arithmetic number, because the mean of its divisors is an integer number (21437136).

Almost surely, 2^85728319 is an apocalyptic number.

85728319 is a deficient number, since it is larger than the sum of its proper divisors (20225).

85728319 is a wasteful number, since it uses less digits than its factorization.

85728319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20224.

The product of its digits is 120960, while the sum is 43.

The square root of 85728319 is about 9258.9588507564. The cubic root of 85728319 is about 440.9351992308.

The spelling of 85728319 in words is "eighty-five million, seven hundred twenty-eight thousand, three hundred nineteen".