7220624 has 20 divisors (see below), whose sum is σ = 14369244. Its totient is φ = 3512448.

The previous prime is 7220621. The next prime is 7220671. The reversal of 7220624 is 4260227.

It can be written as a sum of positive squares in 2 ways, for example, as 5856400 + 1364224 = 2420^2 + 1168^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 7220624.

It is not an unprimeable number, because it can be changed into a prime (7220621) 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, 5507 + ... + 6690.

Almost surely, 2^7220624 is an apocalyptic number.

7220624 is a gapful number since it is divisible by the number (74) formed by its first and last digit.

It is an amenable number.

7220624 is a deficient number, since it is larger than the sum of its proper divisors (7148620).

7220624 is a wasteful number, since it uses less digits than its factorization.

7220624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12242 (or 12236 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 23.

The square root of 7220624 is about 2687.1218803768. The cubic root of 7220624 is about 193.2820738725.

The spelling of 7220624 in words is "seven million, two hundred twenty thousand, six hundred twenty-four".