65620866 has 32 divisors (see below), whose sum is σ = 133076160. Its totient is φ = 21570624.

The previous prime is 65620861. The next prime is 65620871. The reversal of 65620866 is 66802656.

65620866 is digitally balanced in base 2, 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 (65620861) and next prime (65620871).

It is not an unprimeable number, because it can be changed into a prime (65620861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 223816 + ... + 224108.

It is an arithmetic number, because the mean of its divisors is an integer number (4158630).

Almost surely, 2^65620866 is an apocalyptic number.

65620866 is an abundant number, since it is smaller than the sum of its proper divisors (67455294).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

65620866 is a wasteful number, since it uses less digits than its factorization.

65620866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 690.

The product of its (nonzero) digits is 103680, while the sum is 39.

The square root of 65620866 is about 8100.6707129719. The cubic root of 65620866 is about 403.3486915962.

The spelling of 65620866 in words is "sixty-five million, six hundred twenty thousand, eight hundred sixty-six".