66460840 has 24 divisors (see below), whose sum is σ = 149652990. Its totient is φ = 26563712.

The previous prime is 66460819. The next prime is 66460873. The reversal of 66460840 is 4806466.

It can be written as a sum of positive squares in 3 ways, for example, as 65383396 + 1077444 = 8086^2 + 1038^2 .

It is a junction number, because it is equal to n+sod(n) for n = 66460796 and 66460805.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 50916 + ... + 52204.

Almost surely, 2^66460840 is an apocalyptic number.

It is an amenable number.

66460840 is an abundant number, since it is smaller than the sum of its proper divisors (83192150).

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

66460840 is an equidigital number, since it uses as much as digits as its factorization.

66460840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2589 (or 1296 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 34.

The square root of 66460840 is about 8152.3518079141. The cubic root of 66460840 is about 405.0624097289.

It can be divided in two parts, 664 and 60840, that added together give a square (61504 = 248²).

The spelling of 66460840 in words is "sixty-six million, four hundred sixty thousand, eight hundred forty".