85778819 has 8 divisors (see below), whose sum is σ = 98105088. Its totient is φ = 73470600.

The previous prime is 85778813. The next prime is 85778831. The reversal of 85778819 is 91887758.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-85778819 is a prime.

It is a super-2 number, since 2×85778819² = 14716011578069522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85778813) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7994 + ... + 15344.

It is an arithmetic number, because the mean of its divisors is an integer number (12263136).

Almost surely, 2^85778819 is an apocalyptic number.

85778819 is a deficient number, since it is larger than the sum of its proper divisors (12326269).

85778819 is a wasteful number, since it uses less digits than its factorization.

85778819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9025.

The product of its digits is 1128960, while the sum is 53.

The square root of 85778819 is about 9261.6855377410. The cubic root of 85778819 is about 441.0217628344.

The spelling of 85778819 in words is "eighty-five million, seven hundred seventy-eight thousand, eight hundred nineteen".