86732721 has 8 divisors (see below), whose sum is σ = 128492960. Its totient is φ = 57821796.

The previous prime is 86732693. The next prime is 86732729. The reversal of 86732721 is 12723768.

It is not a de Polignac number, because 86732721 - 2⁹ = 86732209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (86732729) 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, 1606135 + ... + 1606188.

It is an arithmetic number, because the mean of its divisors is an integer number (16061620).

Almost surely, 2^86732721 is an apocalyptic number.

It is an amenable number.

86732721 is a deficient number, since it is larger than the sum of its proper divisors (41760239).

86732721 is a wasteful number, since it uses less digits than its factorization.

86732721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3212332 (or 3212326 counting only the distinct ones).

The product of its digits is 28224, while the sum is 36.

The square root of 86732721 is about 9313.0403735837. The cubic root of 86732721 is about 442.6505319512.

The spelling of 86732721 in words is "eighty-six million, seven hundred thirty-two thousand, seven hundred twenty-one".