86289821 has 4 divisors (see below), whose sum is σ = 86328444. Its totient is φ = 86251200.

The previous prime is 86289817. The next prime is 86289823. The reversal of 86289821 is 12898268.

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

It can be written as a sum of positive squares in 2 ways, for example, as 264196 + 86025625 = 514^2 + 9275^2 .

It is a cyclic number.

It is not a de Polignac number, because 86289821 - 2² = 86289817 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 (86289823) 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, 15740 + ... + 20501.

It is an arithmetic number, because the mean of its divisors is an integer number (21582111).

Almost surely, 2^86289821 is an apocalyptic number.

It is an amenable number.

86289821 is a deficient number, since it is larger than the sum of its proper divisors (38623).

86289821 is a wasteful number, since it uses less digits than its factorization.

86289821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38622.

The product of its digits is 110592, while the sum is 44.

The square root of 86289821 is about 9289.2314536780. The cubic root of 86289821 is about 441.8957818890.

The spelling of 86289821 in words is "eighty-six million, two hundred eighty-nine thousand, eight hundred twenty-one".