8720005 has 8 divisors (see below), whose sum is σ = 11958912. Its totient is φ = 5979408.

The previous prime is 8719999. The next prime is 8720027. The reversal of 8720005 is 5000278.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8720005 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 124537 + ... + 124606.

It is an arithmetic number, because the mean of its divisors is an integer number (1494864).

Almost surely, 2^8720005 is an apocalyptic number.

It is an amenable number.

8720005 is a deficient number, since it is larger than the sum of its proper divisors (3238907).

8720005 is a wasteful number, since it uses less digits than its factorization.

8720005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249155.

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 8720005 is about 2952.9654586534. The cubic root of 8720005 is about 205.8285326546.

The spelling of 8720005 in words is "eight million, seven hundred twenty thousand, five".