85778047 has 4 divisors (see below), whose sum is σ = 86291856. Its totient is φ = 85264240.

The previous prime is 85777999. The next prime is 85778057. The reversal of 85778047 is 74087758.

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 85778047 - 2¹⁵ = 85745279 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 85777988 and 85778006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85778057) 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, 256654 + ... + 256987.

It is an arithmetic number, because the mean of its divisors is an integer number (21572964).

Almost surely, 2^85778047 is an apocalyptic number.

85778047 is a deficient number, since it is larger than the sum of its proper divisors (513809).

85778047 is a wasteful number, since it uses less digits than its factorization.

85778047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 513808.

The product of its (nonzero) digits is 439040, while the sum is 46.

The square root of 85778047 is about 9261.6438605682. The cubic root of 85778047 is about 441.0204397812.

The spelling of 85778047 in words is "eighty-five million, seven hundred seventy-eight thousand, forty-seven".