7661865 has 16 divisors (see below), whose sum is σ = 12302208. Its totient is φ = 4071936.

The previous prime is 7661851. The next prime is 7661881. The reversal of 7661865 is 5681667.

7661865 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 7661865 - 2⁵ = 7661833 is a prime.

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, 4572 + ... + 6018.

It is an arithmetic number, because the mean of its divisors is an integer number (768888).

Almost surely, 2^7661865 is an apocalyptic number.

It is an amenable number.

7661865 is a deficient number, since it is larger than the sum of its proper divisors (4640343).

7661865 is a wasteful number, since it uses less digits than its factorization.

7661865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1808.

The product of its digits is 60480, while the sum is 39.

The square root of 7661865 is about 2768.0074060595. The cubic root of 7661865 is about 197.1415492607.

The spelling of 7661865 in words is "seven million, six hundred sixty-one thousand, eight hundred sixty-five".