86720909 has 8 divisors (see below), whose sum is σ = 95031552. Its totient is φ = 78481440.

The previous prime is 86720903. The next prime is 86720939. The reversal of 86720909 is 90902768.

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 86720909 - 2⁸ = 86720653 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86720903) 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, 15224 + ... + 20129.

It is an arithmetic number, because the mean of its divisors is an integer number (11878944).

Almost surely, 2^86720909 is an apocalyptic number.

It is an amenable number.

86720909 is a deficient number, since it is larger than the sum of its proper divisors (8310643).

86720909 is a wasteful number, since it uses less digits than its factorization.

86720909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35587.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 86720909 is about 9312.4061874469. The cubic root of 86720909 is about 442.6304364002.

The spelling of 86720909 in words is "eighty-six million, seven hundred twenty thousand, nine hundred nine".