7720105 has 4 divisors (see below), whose sum is σ = 9264132. Its totient is φ = 6176080.

The previous prime is 7720103. The next prime is 7720109. The reversal of 7720105 is 5010277.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5010277 = 127 ⋅39451.

It can be written as a sum of positive squares in 2 ways, for example, as 4678569 + 3041536 = 2163^2 + 1744^2 .

It is not a de Polignac number, because 7720105 - 2¹ = 7720103 is a prime.

It is a super-2 number, since 2×7720105² = 119200042422050, which contains 22 as substring.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7720103) by changing a digit.

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, 772006 + ... + 772015.

It is an arithmetic number, because the mean of its divisors is an integer number (2316033).

Almost surely, 2^7720105 is an apocalyptic number.

It is an amenable number.

7720105 is a deficient number, since it is larger than the sum of its proper divisors (1544027).

7720105 is a wasteful number, since it uses less digits than its factorization.

7720105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1544026.

The product of its (nonzero) digits is 490, while the sum is 22.

The square root of 7720105 is about 2778.5076929892. The cubic root of 7720105 is about 197.6397984740.

The spelling of 7720105 in words is "seven million, seven hundred twenty thousand, one hundred five".