66480840 has 48 divisors (see below), whose sum is σ = 216063900. Its totient is φ = 17728128.

The previous prime is 66480839. The next prime is 66480851. The reversal of 66480840 is 4808466.

66480840 is a `hidden beast` number, since 6 + 648 + 0 + 8 + 4 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 62631396 + 3849444 = 7914^2 + 1962^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 66480795 and 66480804.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 91975 + ... + 92694.

Almost surely, 2^66480840 is an apocalyptic number.

66480840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66480840 is an abundant number, since it is smaller than the sum of its proper divisors (149583060).

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

66480840 is a wasteful number, since it uses less digits than its factorization.

66480840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184686 (or 184679 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 36.

The square root of 66480840 is about 8153.5783555443. The cubic root of 66480840 is about 405.1030373411.

It can be divided in two parts, 6 and 6480840, that added together give a palindrome (6480846).

The spelling of 66480840 in words is "sixty-six million, four hundred eighty thousand, eight hundred forty".