85896721 has 8 divisors (see below), whose sum is σ = 88337384. Its totient is φ = 83462400.

The previous prime is 85896703. The next prime is 85896737. The reversal of 85896721 is 12769858.

It can be written as a sum of positive squares in 4 ways, for example, as 9579025 + 76317696 = 3095^2 + 8736^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a 2-Lehmer number, since φ(85896721) divides (85896721-1)².

It is a cyclic number.

It is not a de Polignac number, because 85896721 - 2⁷ = 85896593 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 (85896751) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 43471 + ... + 45403.

It is an arithmetic number, because the mean of its divisors is an integer number (11042173).

Almost surely, 2^85896721 is an apocalyptic number.

It is an amenable number.

85896721 is a deficient number, since it is larger than the sum of its proper divisors (2440663).

85896721 is a wasteful number, since it uses less digits than its factorization.

85896721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3171.

The product of its digits is 241920, while the sum is 46.

The square root of 85896721 is about 9268.0483921913. The cubic root of 85896721 is about 441.2237301087.

It can be divided in two parts, 858 and 96721, that added together give a palindrome (97579).

The spelling of 85896721 in words is "eighty-five million, eight hundred ninety-six thousand, seven hundred twenty-one".