85451638 has 4 divisors (see below), whose sum is σ = 128177460. Its totient is φ = 42725818.

The previous prime is 85451629. The next prime is 85451657. The reversal of 85451638 is 83615458.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 85451638.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21362908 + ... + 21362911.

It is an arithmetic number, because the mean of its divisors is an integer number (32044365).

Almost surely, 2^85451638 is an apocalyptic number.

85451638 is a deficient number, since it is larger than the sum of its proper divisors (42725822).

85451638 is a wasteful number, since it uses less digits than its factorization.

85451638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42725821.

The product of its digits is 115200, while the sum is 40.

The square root of 85451638 is about 9244.0055170905. The cubic root of 85451638 is about 440.4603274667.

The spelling of 85451638 in words is "eighty-five million, four hundred fifty-one thousand, six hundred thirty-eight".