65978180 has 12 divisors (see below), whose sum is σ = 138554220. Its totient is φ = 26391264.

The previous prime is 65978179. The next prime is 65978189. The reversal of 65978180 is 8187956.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 28987456 + 36990724 = 5384^2 + 6082^2 .

It is a super-2 number, since 2×65978180² = 8706240472224800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (65978189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1649435 + ... + 1649474.

It is an arithmetic number, because the mean of its divisors is an integer number (11546185).

Almost surely, 2^65978180 is an apocalyptic number.

It is an amenable number.

65978180 is an abundant number, since it is smaller than the sum of its proper divisors (72576040).

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

65978180 is a wasteful number, since it uses less digits than its factorization.

65978180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3298918 (or 3298916 counting only the distinct ones).

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

The square root of 65978180 is about 8122.6953654560. The cubic root of 65978180 is about 404.0794618720.

The spelling of 65978180 in words is "sixty-five million, nine hundred seventy-eight thousand, one hundred eighty".