8720555 has 4 divisors (see below), whose sum is σ = 10464672. Its totient is φ = 6976440.

The previous prime is 8720533. The next prime is 8720557. The reversal of 8720555 is 5550278.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 8720555 - 2²² = 4526251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8720557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 872051 + ... + 872060.

It is an arithmetic number, because the mean of its divisors is an integer number (2616168).

Almost surely, 2^8720555 is an apocalyptic number.

8720555 is a deficient number, since it is larger than the sum of its proper divisors (1744117).

8720555 is a wasteful number, since it uses less digits than its factorization.

8720555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1744116.

The product of its (nonzero) digits is 14000, while the sum is 32.

The square root of 8720555 is about 2953.0585839092. The cubic root of 8720555 is about 205.8328599959.

The spelling of 8720555 in words is "eight million, seven hundred twenty thousand, five hundred fifty-five".