8720344 has 16 divisors (see below), whose sum is σ = 16422120. Its totient is φ = 4341120.

The previous prime is 8720339. The next prime is 8720347. The reversal of 8720344 is 4430278.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8720347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 334 + ... + 4189.

Almost surely, 2^8720344 is an apocalyptic number.

It is an amenable number.

8720344 is a deficient number, since it is larger than the sum of its proper divisors (7701776).

8720344 is a wasteful number, since it uses less digits than its factorization.

8720344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4770 (or 4766 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 28.

The square root of 8720344 is about 2953.0228580219. The cubic root of 8720344 is about 205.8311998919.

The spelling of 8720344 in words is "eight million, seven hundred twenty thousand, three hundred forty-four".