7768561 has 2 divisors, whose sum is σ = 7768562. Its totient is φ = 7768560.

The previous prime is 7768547. The next prime is 7768567. The reversal of 7768561 is 1658677.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6922161 + 846400 = 2631^2 + 920^2 .

It is a cyclic number.

It is not a de Polignac number, because 7768561 - 2⁹ = 7768049 is a prime.

7768561 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (7768567) 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 as a sum of consecutive naturals, namely, 3884280 + 3884281.

It is an arithmetic number, because the mean of its divisors is an integer number (3884281).

Almost surely, 2^7768561 is an apocalyptic number.

It is an amenable number.

7768561 is a deficient number, since it is larger than the sum of its proper divisors (1).

7768561 is an equidigital number, since it uses as much as digits as its factorization.

7768561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 70560, while the sum is 40.

The square root of 7768561 is about 2787.2138418141. The cubic root of 7768561 is about 198.0524382418.

The spelling of 7768561 in words is "seven million, seven hundred sixty-eight thousand, five hundred sixty-one".