86447819 has 4 divisors (see below), whose sum is σ = 87303840. Its totient is φ = 85591800.

The previous prime is 86447813. The next prime is 86447827. The reversal of 86447819 is 91874468.

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

It is a cyclic number.

It is not a de Polignac number, because 86447819 - 2¹² = 86443723 is a prime.

It is a super-2 number, since 2×86447819² = 14946450819713522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (86447813) 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, 427859 + ... + 428060.

It is an arithmetic number, because the mean of its divisors is an integer number (21825960).

Almost surely, 2^86447819 is an apocalyptic number.

86447819 is a deficient number, since it is larger than the sum of its proper divisors (856021).

86447819 is a wasteful number, since it uses less digits than its factorization.

86447819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 856020.

The product of its digits is 387072, while the sum is 47.

The square root of 86447819 is about 9297.7319277338. The cubic root of 86447819 is about 442.1653234534.

The spelling of 86447819 in words is "eighty-six million, four hundred forty-seven thousand, eight hundred nineteen".