66740740 has 24 divisors (see below), whose sum is σ = 152897472. Its totient is φ = 24269280.

The previous prime is 66740719. The next prime is 66740747. The reversal of 66740740 is 4704766.

66740740 is digitally balanced in base 9, because in such base it contains all the possibile digits an equal number of times.

66740740 is strictly pandigital in base 9.

It is a junction number, because it is equal to n+sod(n) for n = 66740696 and 66740705.

It is not an unprimeable number, because it can be changed into a prime (66740747) 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, 151464 + ... + 151903.

It is an arithmetic number, because the mean of its divisors is an integer number (6370728).

Almost surely, 2^66740740 is an apocalyptic number.

It is an amenable number.

66740740 is an abundant number, since it is smaller than the sum of its proper divisors (86156732).

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

66740740 is a wasteful number, since it uses less digits than its factorization.

66740740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303387 (or 303385 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 34.

The square root of 66740740 is about 8169.5005967317. The cubic root of 66740740 is about 405.6302537775.

The spelling of 66740740 in words is "sixty-six million, seven hundred forty thousand, seven hundred forty".