7661618 has 8 divisors (see below), whose sum is σ = 11508780. Its totient is φ = 3825360.

The previous prime is 7661603. The next prime is 7661639. The reversal of 7661618 is 8161667.

It can be written as a sum of positive squares in 2 ways, for example, as 7656289 + 5329 = 2767^2 + 73^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is an unprimeable number.

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, 653 + ... + 3968.

Almost surely, 2^7661618 is an apocalyptic number.

7661618 is a deficient number, since it is larger than the sum of its proper divisors (3847162).

7661618 is a wasteful number, since it uses less digits than its factorization.

7661618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5452.

The product of its digits is 12096, while the sum is 35.

The square root of 7661618 is about 2767.9627887672. The cubic root of 7661618 is about 197.1394307823.

The spelling of 7661618 in words is "seven million, six hundred sixty-one thousand, six hundred eighteen".