666747120 has 160 divisors (see below), whose sum is σ = 2302977600. Its totient is φ = 158441472.

The previous prime is 666747097. The next prime is 666747127. The reversal of 666747120 is 21747666.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666747127) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 86796 + ... + 94164.

It is an arithmetic number, because the mean of its divisors is an integer number (14393610).

Almost surely, 2^666747120 is an apocalyptic number.

666747120 is a gapful number since it is divisible by the number (60) 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 666747120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1151488800).

666747120 is an abundant number, since it is smaller than the sum of its proper divisors (1636230480).

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

666747120 is a wasteful number, since it uses less digits than its factorization.

666747120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7427 (or 7421 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 39.

The square root of 666747120 is about 25821.4468998157. The cubic root of 666747120 is about 873.6156045529.

The spelling of 666747120 in words is "six hundred sixty-six million, seven hundred forty-seven thousand, one hundred twenty".