86821819 has 8 divisors (see below), whose sum is σ = 99283968. Its totient is φ = 74374440.

The previous prime is 86821817. The next prime is 86821837. The reversal of 86821819 is 91812868.

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

It is not a de Polignac number, because 86821819 - 2¹ = 86821817 is a prime.

It is a super-2 number, since 2×86821819² = 15076056508937522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (86821817) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15744 + ... + 20530.

It is an arithmetic number, because the mean of its divisors is an integer number (12410496).

Almost surely, 2^86821819 is an apocalyptic number.

86821819 is a deficient number, since it is larger than the sum of its proper divisors (12462149).

86821819 is a wasteful number, since it uses less digits than its factorization.

86821819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7385.

The product of its digits is 55296, while the sum is 43.

The square root of 86821819 is about 9317.8226533885. The cubic root of 86821819 is about 442.8020540811.

It can be divided in two parts, 8682 and 1819, that added together give a palindrome (10501).

The spelling of 86821819 in words is "eighty-six million, eight hundred twenty-one thousand, eight hundred nineteen".