85778391 has 8 divisors (see below), whose sum is σ = 115503984. Its totient is φ = 56619200.

The previous prime is 85778377. The next prime is 85778449. The reversal of 85778391 is 19387758.

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

It is a cyclic number.

It is not a de Polignac number, because 85778391 - 2⁵ = 85778359 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 85778391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85771391) 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, 141246 + ... + 141851.

It is an arithmetic number, because the mean of its divisors is an integer number (14437998).

Almost surely, 2^85778391 is an apocalyptic number.

85778391 is a deficient number, since it is larger than the sum of its proper divisors (29725593).

85778391 is a wasteful number, since it uses less digits than its factorization.

85778391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283201.

The product of its digits is 423360, while the sum is 48.

The square root of 85778391 is about 9261.6624317668. The cubic root of 85778391 is about 441.0210293292.

The spelling of 85778391 in words is "eighty-five million, seven hundred seventy-eight thousand, three hundred ninety-one".