65664090 has 24 divisors (see below), whose sum is σ = 170726868. Its totient is φ = 17510400.

The previous prime is 65664077. The next prime is 65664097. The reversal of 65664090 is 9046656.

It is a happy number.

65664090 is a `hidden beast` number, since 6 + 5 + 6 + 640 + 9 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 65464281 + 199809 = 8091^2 + 447^2 .

It is not an unprimeable number, because it can be changed into a prime (65664097) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 364711 + ... + 364890.

Almost surely, 2^65664090 is an apocalyptic number.

65664090 is an abundant number, since it is smaller than the sum of its proper divisors (105062778).

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

65664090 is a wasteful number, since it uses less digits than its factorization.

65664090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 729614 (or 729611 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 65664090 is about 8103.3382010132. The cubic root of 65664090 is about 403.4372331346.

It can be divided in two parts, 656 and 64090, that added together give a palindrome (64746).

The spelling of 65664090 in words is "sixty-five million, six hundred sixty-four thousand, ninety".