66714540 has 72 divisors (see below), whose sum is σ = 190399440. Its totient is φ = 17452800.

The previous prime is 66714539. The next prime is 66714569. The reversal of 66714540 is 4541766.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 612006 + ... + 612114.

Almost surely, 2^66714540 is an apocalyptic number.

66714540 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66714540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95199720).

66714540 is an abundant number, since it is smaller than the sum of its proper divisors (123684900).

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

66714540 is a wasteful number, since it uses less digits than its factorization.

66714540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323 (or 220 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 33.

The square root of 66714540 is about 8167.8969141389. The cubic root of 66714540 is about 405.5771682428.

It can be divided in two parts, 6671 and 4540, that added together give a palindrome (11211).

The spelling of 66714540 in words is "sixty-six million, seven hundred fourteen thousand, five hundred forty".