85478391 has 12 divisors (see below), whose sum is σ = 125208720. Its totient is φ = 56182560.

The previous prime is 85478387. The next prime is 85478413. The reversal of 85478391 is 19387458.

It is not a de Polignac number, because 85478391 - 2² = 85478387 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85478381) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 66246 + ... + 67523.

It is an arithmetic number, because the mean of its divisors is an integer number (10434060).

Almost surely, 2^85478391 is an apocalyptic number.

85478391 is a deficient number, since it is larger than the sum of its proper divisors (39730329).

85478391 is a wasteful number, since it uses less digits than its factorization.

85478391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133846 (or 133843 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The square root of 85478391 is about 9245.4524497182. The cubic root of 85478391 is about 440.5062887687.

The spelling of 85478391 in words is "eighty-five million, four hundred seventy-eight thousand, three hundred ninety-one".