7720642 has 16 divisors (see below), whose sum is σ = 12023352. Its totient is φ = 3715200.

The previous prime is 7720639. The next prime is 7720649. The reversal of 7720642 is 2460277.

It can be written as a sum of positive squares in 4 ways, for example, as 6395841 + 1324801 = 2529^2 + 1151^2 .

It is a super-3 number, since 3×7720642³ (a number of 22 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 7720642.

It is not an unprimeable number, because it can be changed into a prime (7720649) 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 7 ways as a sum of consecutive naturals, for example, 6958 + ... + 7990.

Almost surely, 2^7720642 is an apocalyptic number.

7720642 is a deficient number, since it is larger than the sum of its proper divisors (4302710).

7720642 is a wasteful number, since it uses less digits than its factorization.

7720642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1173.

The product of its (nonzero) digits is 4704, while the sum is 28.

The square root of 7720642 is about 2778.6043259162. The cubic root of 7720642 is about 197.6443808862.

The spelling of 7720642 in words is "seven million, seven hundred twenty thousand, six hundred forty-two".