85644215 has 16 divisors (see below), whose sum is σ = 109055808. Its totient is φ = 64344576.

The previous prime is 85644211. The next prime is 85644239. The reversal of 85644215 is 51244658.

It is a cyclic number.

It is not a de Polignac number, because 85644215 - 2² = 85644211 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85644211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54734 + ... + 56276.

It is an arithmetic number, because the mean of its divisors is an integer number (6815988).

Almost surely, 2^85644215 is an apocalyptic number.

85644215 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

85644215 is a deficient number, since it is larger than the sum of its proper divisors (23411593).

85644215 is a wasteful number, since it uses less digits than its factorization.

85644215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2218.

The product of its digits is 38400, while the sum is 35.

The square root of 85644215 is about 9254.4159729288. The cubic root of 85644215 is about 440.7909584933.

The spelling of 85644215 in words is "eighty-five million, six hundred forty-four thousand, two hundred fifteen".