7661645 has 16 divisors (see below), whose sum is σ = 10160640. Its totient is φ = 5516544.

The previous prime is 7661639. The next prime is 7661663. The reversal of 7661645 is 5461667.

It is a cyclic number.

It is not a de Polignac number, because 7661645 - 2⁶ = 7661581 is a prime.

It is a super-3 number, since 3×7661645³ (a number of 22 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5 + ... + 3914.

It is an arithmetic number, because the mean of its divisors is an integer number (635040).

Almost surely, 2^7661645 is an apocalyptic number.

It is an amenable number.

7661645 is a deficient number, since it is larger than the sum of its proper divisors (2498995).

7661645 is a wasteful number, since it uses less digits than its factorization.

7661645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3964.

The product of its digits is 30240, while the sum is 35.

The square root of 7661645 is about 2767.9676659961. The cubic root of 7661645 is about 197.1396623591.

The spelling of 7661645 in words is "seven million, six hundred sixty-one thousand, six hundred forty-five".