85478647 has 4 divisors (see below), whose sum is σ = 85527360. Its totient is φ = 85429936.

The previous prime is 85478633. The next prime is 85478671. The reversal of 85478647 is 74687458.

It is a happy number.

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 85478647 - 2¹⁵ = 85445879 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 85478647.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85478677) 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, 21622 + ... + 25267.

It is an arithmetic number, because the mean of its divisors is an integer number (21381840).

Almost surely, 2^85478647 is an apocalyptic number.

85478647 is a deficient number, since it is larger than the sum of its proper divisors (48713).

85478647 is a wasteful number, since it uses less digits than its factorization.

85478647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48712.

The product of its digits is 1505280, while the sum is 49.

The square root of 85478647 is about 9245.4662943521. The cubic root of 85478647 is about 440.5067285270.

The spelling of 85478647 in words is "eighty-five million, four hundred seventy-eight thousand, six hundred forty-seven".