7740561 has 4 divisors (see below), whose sum is σ = 10320752. Its totient is φ = 5160372.

The previous prime is 7740547. The next prime is 7740563. The reversal of 7740561 is 1650477.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 7740561 - 2⁷ = 7740433 is a prime.

It is a Duffinian number.

7740561 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (7740563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1290091 + ... + 1290096.

It is an arithmetic number, because the mean of its divisors is an integer number (2580188).

Almost surely, 2^7740561 is an apocalyptic number.

It is an amenable number.

7740561 is a deficient number, since it is larger than the sum of its proper divisors (2580191).

7740561 is a wasteful number, since it uses less digits than its factorization.

7740561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2580190.

The product of its (nonzero) digits is 5880, while the sum is 30.

The square root of 7740561 is about 2782.1863704648. The cubic root of 7740561 is about 197.8142069014.

The spelling of 7740561 in words is "seven million, seven hundred forty thousand, five hundred sixty-one".