85019779 has 4 divisors (see below), whose sum is σ = 91559776. Its totient is φ = 78479784.

The previous prime is 85019777. The next prime is 85019783. The reversal of 85019779 is 97791058.

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 85019779 - 2¹ = 85019777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85019777) 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, 3269979 + ... + 3270004.

It is an arithmetic number, because the mean of its divisors is an integer number (22889944).

Almost surely, 2^85019779 is an apocalyptic number.

85019779 is a deficient number, since it is larger than the sum of its proper divisors (6539997).

85019779 is a wasteful number, since it uses less digits than its factorization.

85019779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6539996.

The product of its (nonzero) digits is 158760, while the sum is 46.

The square root of 85019779 is about 9220.6170617806. The cubic root of 85019779 is about 439.7170684509.

The spelling of 85019779 in words is "eighty-five million, nineteen thousand, seven hundred seventy-nine".