66742388 has 12 divisors (see below), whose sum is σ = 116878272. Its totient is φ = 33348600.

The previous prime is 66742387. The next prime is 66742409. The reversal of 66742388 is 88324766.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66742387) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2213 + ... + 11763.

It is an arithmetic number, because the mean of its divisors is an integer number (9739856).

Almost surely, 2^66742388 is an apocalyptic number.

It is an amenable number.

66742388 is a deficient number, since it is larger than the sum of its proper divisors (50135884).

66742388 is a wasteful number, since it uses less digits than its factorization.

66742388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11302 (or 11300 counting only the distinct ones).

The product of its digits is 387072, while the sum is 44.

The square root of 66742388 is about 8169.6014590676. The cubic root of 66742388 is about 405.6335924337.

The spelling of 66742388 in words is "sixty-six million, seven hundred forty-two thousand, three hundred eighty-eight".