66747340 has 48 divisors (see below), whose sum is σ = 157860864. Its totient is φ = 23486400.

The previous prime is 66747301. The next prime is 66747341. The reversal of 66747340 is 4374766.

It is a self number, because there is not a number n which added to its sum of digits gives 66747340.

It is not an unprimeable number, because it can be changed into a prime (66747341) 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, 1927 + ... + 11713.

It is an arithmetic number, because the mean of its divisors is an integer number (3288768).

Almost surely, 2^66747340 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66747340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78930432).

66747340 is an abundant number, since it is smaller than the sum of its proper divisors (91113524).

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

66747340 is a wasteful number, since it uses less digits than its factorization.

66747340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9838 (or 9836 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 37.

The square root of 66747340 is about 8169.9045282059. The cubic root of 66747340 is about 405.6436242787.

The spelling of 66747340 in words is "sixty-six million, seven hundred forty-seven thousand, three hundred forty".