86447721 has 8 divisors (see below), whose sum is σ = 118075104. Its totient is φ = 56226080.

The previous prime is 86447693. The next prime is 86447741. The reversal of 86447721 is 12774468.

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

It is a cyclic number.

It is not a de Polignac number, because 86447721 - 2⁶ = 86447657 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 86447721.

It is not an unprimeable number, because it can be changed into a prime (86447741) 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 7 ways as a sum of consecutive naturals, for example, 351291 + ... + 351536.

It is an arithmetic number, because the mean of its divisors is an integer number (14759388).

Almost surely, 2^86447721 is an apocalyptic number.

It is an amenable number.

86447721 is a deficient number, since it is larger than the sum of its proper divisors (31627383).

86447721 is a wasteful number, since it uses less digits than its factorization.

86447721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 702871.

The product of its digits is 75264, while the sum is 39.

The square root of 86447721 is about 9297.7266576298. The cubic root of 86447721 is about 442.1651563691.

The spelling of 86447721 in words is "eighty-six million, four hundred forty-seven thousand, seven hundred twenty-one".