65980128 has 48 divisors (see below), whose sum is σ = 183390480. Its totient is φ = 20699136.

The previous prime is 65980093. The next prime is 65980147. The reversal of 65980128 is 82108956.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18583 + ... + 21846.

It is an arithmetic number, because the mean of its divisors is an integer number (3820635).

Almost surely, 2^65980128 is an apocalyptic number.

65980128 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

65980128 is an abundant number, since it is smaller than the sum of its proper divisors (117410352).

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

65980128 is a wasteful number, since it uses less digits than its factorization.

65980128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40459 (or 40451 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 39.

The square root of 65980128 is about 8122.8152755064. The cubic root of 65980128 is about 404.0834386365.

The spelling of 65980128 in words is "sixty-five million, nine hundred eighty thousand, one hundred twenty-eight".