8720013 has 16 divisors (see below), whose sum is σ = 12418560. Its totient is φ = 5429424.

The previous prime is 8719999. The next prime is 8720027. The reversal of 8720013 is 3100278.

It is an interprime number because it is at equal distance from previous prime (8719999) and next prime (8720027).

It is not a de Polignac number, because 8720013 - 2¹³ = 8711821 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8720113) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1498 + ... + 4436.

It is an arithmetic number, because the mean of its divisors is an integer number (776160).

Almost surely, 2^8720013 is an apocalyptic number.

It is an amenable number.

8720013 is a deficient number, since it is larger than the sum of its proper divisors (3698547).

8720013 is a wasteful number, since it uses less digits than its factorization.

8720013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3008.

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 8720013 is about 2952.9668132236. The cubic root of 8720013 is about 205.8285955991.

It can be divided in two parts, 87 and 20013, that added together give a triangular number (20100 = T₂₀₀).

The spelling of 8720013 in words is "eight million, seven hundred twenty thousand, thirteen".