86821977 has 12 divisors (see below), whose sum is σ = 127243760. Its totient is φ = 52619160.

The previous prime is 86821967. The next prime is 86821991. The reversal of 86821977 is 77912868.

It is not a de Polignac number, because 86821977 - 2⁴ = 86821961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (86821967) 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 11 ways as a sum of consecutive naturals, for example, 119227 + ... + 119952.

Almost surely, 2^86821977 is an apocalyptic number.

It is an amenable number.

86821977 is a deficient number, since it is larger than the sum of its proper divisors (40421783).

86821977 is a wasteful number, since it uses less digits than its factorization.

86821977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239204 (or 239193 counting only the distinct ones).

The product of its digits is 338688, while the sum is 48.

The square root of 86821977 is about 9317.8311317602. The cubic root of 86821977 is about 442.8023226875.

The spelling of 86821977 in words is "eighty-six million, eight hundred twenty-one thousand, nine hundred seventy-seven".