85640038 has 12 divisors (see below), whose sum is σ = 140209308. Its totient is φ = 38907560.

The previous prime is 85639993. The next prime is 85640057. The reversal of 85640038 is 83004658.

It is a super-2 number, since 2×85640038² = 14668432217282888, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 85639985 and 85640012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 42420 + ... + 44392.

It is an arithmetic number, because the mean of its divisors is an integer number (11684109).

Almost surely, 2^85640038 is an apocalyptic number.

85640038 is a deficient number, since it is larger than the sum of its proper divisors (54569270).

85640038 is an equidigital number, since it uses as much as digits as its factorization.

85640038 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3959 (or 1986 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 34.

The square root of 85640038 is about 9254.1902941316. The cubic root of 85640038 is about 440.7837923593.

The spelling of 85640038 in words is "eighty-five million, six hundred forty thousand, thirty-eight".