65117680 has 20 divisors (see below), whose sum is σ = 151398792. Its totient is φ = 26047040.

The previous prime is 65117677. The next prime is 65117681. The reversal of 65117680 is 8671156.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65117681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 406906 + ... + 407065.

Almost surely, 2^65117680 is an apocalyptic number.

It is an amenable number.

65117680 is an abundant number, since it is smaller than the sum of its proper divisors (86281112).

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

65117680 is a wasteful number, since it uses less digits than its factorization.

65117680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 813984 (or 813978 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 65117680 is about 8069.5526517893. The cubic root of 65117680 is about 402.3150752172.

The spelling of 65117680 in words is "sixty-five million, one hundred seventeen thousand, six hundred eighty".