7720424 has 16 divisors (see below), whose sum is σ = 14626500. Its totient is φ = 3820032.

The previous prime is 7720399. The next prime is 7720429. The reversal of 7720424 is 4240277.

It can be written as a sum of positive squares in 2 ways, for example, as 7672900 + 47524 = 2770^2 + 218^2 .

It is a junction number, because it is equal to n+sod(n) for n = 7720393 and 7720402.

It is not an unprimeable number, because it can be changed into a prime (7720429) 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, 4199 + ... + 5750.

Almost surely, 2^7720424 is an apocalyptic number.

It is an amenable number.

7720424 is a deficient number, since it is larger than the sum of its proper divisors (6906076).

7720424 is a wasteful number, since it uses less digits than its factorization.

7720424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10052 (or 10048 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 26.

The square root of 7720424 is about 2778.5650973119. The cubic root of 7720424 is about 197.6425206402.

The spelling of 7720424 in words is "seven million, seven hundred twenty thousand, four hundred twenty-four".