66723340 has 12 divisors (see below), whose sum is σ = 140119056. Its totient is φ = 26689328.

The previous prime is 66723337. The next prime is 66723341. The reversal of 66723340 is 4332766.

It is not an unprimeable number, because it can be changed into a prime (66723341) 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, 1668064 + ... + 1668103.

It is an arithmetic number, because the mean of its divisors is an integer number (11676588).

Almost surely, 2^66723340 is an apocalyptic number.

It is an amenable number.

66723340 is an abundant number, since it is smaller than the sum of its proper divisors (73395716).

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

66723340 is a wasteful number, since it uses less digits than its factorization.

66723340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3336176 (or 3336174 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 31.

The square root of 66723340 is about 8168.4355907358. The cubic root of 66723340 is about 405.5950000486.

The spelling of 66723340 in words is "sixty-six million, seven hundred twenty-three thousand, three hundred forty".