7661985 has 16 divisors (see below), whose sum is σ = 12980736. Its totient is φ = 3845888.

The previous prime is 7661981. The next prime is 7661989. The reversal of 7661985 is 5891667.

7661985 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (7661981) and next prime (7661989).

It is a cyclic number.

It is not a de Polignac number, because 7661985 - 2² = 7661981 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7661981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14769 + ... + 15278.

It is an arithmetic number, because the mean of its divisors is an integer number (811296).

Almost surely, 2^7661985 is an apocalyptic number.

It is an amenable number.

7661985 is a deficient number, since it is larger than the sum of its proper divisors (5318751).

7661985 is a wasteful number, since it uses less digits than its factorization.

7661985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30072.

The product of its digits is 90720, while the sum is 42.

The square root of 7661985 is about 2768.0290822172. The cubic root of 7661985 is about 197.1425784645.

It can be divided in two parts, 7661 and 985, that added together give a triangular number (8646 = T₁₃₁).

The spelling of 7661985 in words is "seven million, six hundred sixty-one thousand, nine hundred eighty-five".