66739340 has 12 divisors (see below), whose sum is σ = 140152656. Its totient is φ = 26695728.

The previous prime is 66739339. The next prime is 66739417. The reversal of 66739340 is 4393766.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 66739294 and 66739303.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1668464 + ... + 1668503.

It is an arithmetic number, because the mean of its divisors is an integer number (11679388).

Almost surely, 2^66739340 is an apocalyptic number.

It is an amenable number.

66739340 is an abundant number, since it is smaller than the sum of its proper divisors (73413316).

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

66739340 is a wasteful number, since it uses less digits than its factorization.

66739340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3336976 (or 3336974 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 38.

The square root of 66739340 is about 8169.4149117302. The cubic root of 66739340 is about 405.6274174973.

The spelling of 66739340 in words is "sixty-six million, seven hundred thirty-nine thousand, three hundred forty".