86721724 has 12 divisors (see below), whose sum is σ = 155464848. Its totient is φ = 42303200.

The previous prime is 86721703. The next prime is 86721749. The reversal of 86721724 is 42712768.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 264232 + ... + 264559.

It is an arithmetic number, because the mean of its divisors is an integer number (12955404).

Almost surely, 2^86721724 is an apocalyptic number.

It is an amenable number.

86721724 is a deficient number, since it is larger than the sum of its proper divisors (68743124).

86721724 is a wasteful number, since it uses less digits than its factorization.

86721724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 528836 (or 528834 counting only the distinct ones).

The product of its digits is 37632, while the sum is 37.

The square root of 86721724 is about 9312.4499461742. The cubic root of 86721724 is about 442.6318230042.

The spelling of 86721724 in words is "eighty-six million, seven hundred twenty-one thousand, seven hundred twenty-four".