65871980 has 24 divisors (see below), whose sum is σ = 138653088. Its totient is φ = 26287488.

The previous prime is 65871959. The next prime is 65871997. The reversal of 65871980 is 8917856.

65871980 = 128² + 129² + ... + 584².

It is a happy number.

65871980 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 5537 + ... + 12743.

It is an arithmetic number, because the mean of its divisors is an integer number (5777212).

Almost surely, 2^65871980 is an apocalyptic number.

It is an amenable number.

65871980 is an abundant number, since it is smaller than the sum of its proper divisors (72781108).

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

65871980 is a wasteful number, since it uses less digits than its factorization.

65871980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7673 (or 7671 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 44.

The square root of 65871980 is about 8116.1554938283. The cubic root of 65871980 is about 403.8625402363.

The spelling of 65871980 in words is "sixty-five million, eight hundred seventy-one thousand, nine hundred eighty".