66710440 has 64 divisors (see below), whose sum is σ = 156816000. Its totient is φ = 25509120.

The previous prime is 66710407. The next prime is 66710447. The reversal of 66710440 is 4401766.

It is a junction number, because it is equal to n+sod(n) for n = 66710399 and 66710408.

It is not an unprimeable number, because it can be changed into a prime (66710447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 151741 + ... + 152179.

It is an arithmetic number, because the mean of its divisors is an integer number (2450250).

Almost surely, 2^66710440 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 66710440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78408000).

66710440 is an abundant number, since it is smaller than the sum of its proper divisors (90105560).

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

66710440 is a wasteful number, since it uses less digits than its factorization.

66710440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610 (or 606 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 66710440 is about 8167.6459276832. The cubic root of 66710440 is about 405.5688597069.

The spelling of 66710440 in words is "sixty-six million, seven hundred ten thousand, four hundred forty".