66711744 has 84 divisors (see below), whose sum is σ = 208620360. Its totient is φ = 20213760.

The previous prime is 66711737. The next prime is 66711751. The reversal of 66711744 is 44711766.

It is an interprime number because it is at equal distance from previous prime (66711737) and next prime (66711751).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 66711699 and 66711708.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1072 + ... + 11600.

Almost surely, 2^66711744 is an apocalyptic number.

66711744 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66711744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104310180).

66711744 is an abundant number, since it is smaller than the sum of its proper divisors (141908616).

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

66711744 is a wasteful number, since it uses less digits than its factorization.

66711744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10558 (or 10545 counting only the distinct ones).

The product of its digits is 28224, while the sum is 36.

The square root of 66711744 is about 8167.7257544558. The cubic root of 66711744 is about 405.5715022635.

The spelling of 66711744 in words is "sixty-six million, seven hundred eleven thousand, seven hundred forty-four".