66437860 has 24 divisors (see below), whose sum is σ = 140297976. Its totient is φ = 26426880.

The previous prime is 66437849. The next prime is 66437863. The reversal of 66437860 is 6873466.

It can be written as a sum of positive squares in 4 ways, for example, as 7086244 + 59351616 = 2662^2 + 7704^2 .

It is not an unprimeable number, because it can be changed into a prime (66437863) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5557 + ... + 12796.

It is an arithmetic number, because the mean of its divisors is an integer number (5845749).

Almost surely, 2^66437860 is an apocalyptic number.

It is an amenable number.

66437860 is an abundant number, since it is smaller than the sum of its proper divisors (73860116).

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

66437860 is a wasteful number, since it uses less digits than its factorization.

66437860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18543 (or 18541 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 40.

The square root of 66437860 is about 8150.9422768168. The cubic root of 66437860 is about 405.0157185384.

The spelling of 66437860 in words is "sixty-six million, four hundred thirty-seven thousand, eight hundred sixty".