8720650 has 12 divisors (see below), whose sum is σ = 16220502. Its totient is φ = 3488240.

The previous prime is 8720629. The next prime is 8720671. The reversal of 8720650 is 560278.

8720650 is nontrivially palindromic in base 7.

It is an interprime number because it is at equal distance from previous prime (8720629) and next prime (8720671).

It can be written as a sum of positive squares in 3 ways, for example, as 8003241 + 717409 = 2829^2 + 847^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 87157 + ... + 87256.

Almost surely, 2^8720650 is an apocalyptic number.

8720650 is a deficient number, since it is larger than the sum of its proper divisors (7499852).

8720650 is a wasteful number, since it uses less digits than its factorization.

8720650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174425 (or 174420 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 8720650 is about 2953.0746688833. The cubic root of 8720650 is about 205.8336074273.

The spelling of 8720650 in words is "eight million, seven hundred twenty thousand, six hundred fifty".