660374640 has 160 divisors (see below), whose sum is σ = 2394489600. Its totient is φ = 166821120.

The previous prime is 660374629. The next prime is 660374641. The reversal of 660374640 is 46473066.

660374640 is a `hidden beast` number, since 6 + 6 + 0 + 3 + 7 + 4 + 640 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 660374595 and 660374604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660374641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 32995 + ... + 49085.

It is an arithmetic number, because the mean of its divisors is an integer number (14965560).

Almost surely, 2^660374640 is an apocalyptic number.

660374640 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 660374640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1197244800).

660374640 is an abundant number, since it is smaller than the sum of its proper divisors (1734114960).

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

660374640 is a wasteful number, since it uses less digits than its factorization.

660374640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16132 (or 16120 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 36.

The square root of 660374640 is about 25697.7555440159. The cubic root of 660374640 is about 870.8234771491.

The spelling of 660374640 in words is "six hundred sixty million, three hundred seventy-four thousand, six hundred forty".