65880020 has 24 divisors (see below), whose sum is σ = 138555144. Its totient is φ = 26312576.

The previous prime is 65880019. The next prime is 65880043. The reversal of 65880020 is 2008856.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 11916304 + 53963716 = 3452^2 + 7346^2 .

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, 13874 + ... + 18006.

It is an arithmetic number, because the mean of its divisors is an integer number (5773131).

Almost surely, 2^65880020 is an apocalyptic number.

It is an amenable number.

65880020 is an abundant number, since it is smaller than the sum of its proper divisors (72675124).

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

65880020 is a wasteful number, since it uses less digits than its factorization.

65880020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4939 (or 4937 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 65880020 is about 8116.6507871166. The cubic root of 65880020 is about 403.8789707061.

Adding to 65880020 its reverse (2008856), we get a palindrome (67888876).

The spelling of 65880020 in words is "sixty-five million, eight hundred eighty thousand, twenty".