86644971 has 80 divisors (see below), whose sum is σ = 159952320. Its totient is φ = 45619200.

The previous prime is 86644967. The next prime is 86645021. The reversal of 86644971 is 17944668.

It is not a de Polignac number, because 86644971 - 2² = 86644967 is a prime.

It is not an unprimeable number, because it can be changed into a prime (86604971) 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 79 ways as a sum of consecutive naturals, for example, 857821 + ... + 857921.

It is an arithmetic number, because the mean of its divisors is an integer number (1999404).

Almost surely, 2^86644971 is an apocalyptic number.

86644971 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

86644971 is a deficient number, since it is larger than the sum of its proper divisors (73307349).

86644971 is a wasteful number, since it uses less digits than its factorization.

86644971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226 (or 217 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 86644971 is about 9308.3280453581. The cubic root of 86644971 is about 442.5012008011.

The spelling of 86644971 in words is "eighty-six million, six hundred forty-four thousand, nine hundred seventy-one".