66740538 has 32 divisors (see below), whose sum is σ = 144789120. Its totient is φ = 20426240.

The previous prime is 66740519. The next prime is 66740539. The reversal of 66740538 is 83504766.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 66740496 and 66740505.

It is not an unprimeable number, because it can be changed into a prime (66740539) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3798 + ... + 12161.

It is an arithmetic number, because the mean of its divisors is an integer number (4524660).

Almost surely, 2^66740538 is an apocalyptic number.

66740538 is an abundant number, since it is smaller than the sum of its proper divisors (78048582).

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

66740538 is a wasteful number, since it uses less digits than its factorization.

66740538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16022.

The product of its (nonzero) digits is 120960, while the sum is 39.

The square root of 66740538 is about 8169.4882336656. The cubic root of 66740538 is about 405.6298445452.

The spelling of 66740538 in words is "sixty-six million, seven hundred forty thousand, five hundred thirty-eight".