7720340 has 12 divisors (see below), whose sum is σ = 16212756. Its totient is φ = 3088128.

The previous prime is 7720337. The next prime is 7720357. The reversal of 7720340 is 430277.

It can be written as a sum of positive squares in 2 ways, for example, as 5299204 + 2421136 = 2302^2 + 1556^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 192989 + ... + 193028.

It is an arithmetic number, because the mean of its divisors is an integer number (1351063).

Almost surely, 2^7720340 is an apocalyptic number.

It is an amenable number.

7720340 is an abundant number, since it is smaller than the sum of its proper divisors (8492416).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7720340 is a wasteful number, since it uses less digits than its factorization.

7720340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 386026 (or 386024 counting only the distinct ones).

The product of its (nonzero) digits is 1176, while the sum is 23.

The square root of 7720340 is about 2778.5499815551. The cubic root of 7720340 is about 197.6418038388.

The spelling of 7720340 in words is "seven million, seven hundred twenty thousand, three hundred forty".