85478321 has 4 divisors (see below), whose sum is σ = 89977200. Its totient is φ = 80979444.

The previous prime is 85478299. The next prime is 85478333. The reversal of 85478321 is 12387458.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 85478321 - 2⁶ = 85478257 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian 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 3 ways as a sum of consecutive naturals, for example, 2249411 + ... + 2249448.

It is an arithmetic number, because the mean of its divisors is an integer number (22494300).

Almost surely, 2^85478321 is an apocalyptic number.

It is an amenable number.

85478321 is a deficient number, since it is larger than the sum of its proper divisors (4498879).

85478321 is a wasteful number, since it uses less digits than its factorization.

85478321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4498878.

The product of its digits is 53760, while the sum is 38.

The square root of 85478321 is about 9245.4486640725. The cubic root of 85478321 is about 440.5061685221.

The spelling of 85478321 in words is "eighty-five million, four hundred seventy-eight thousand, three hundred twenty-one".