666247344 has 40 divisors (see below), whose sum is σ = 1967016960. Its totient is φ = 190356288.

The previous prime is 666247297. The next prime is 666247367. The reversal of 666247344 is 443742666.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 666247296 and 666247305.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 991104 + ... + 991775.

It is an arithmetic number, because the mean of its divisors is an integer number (49175424).

Almost surely, 2^666247344 is an apocalyptic number.

It is an amenable number.

666247344 is an abundant number, since it is smaller than the sum of its proper divisors (1300769616).

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

666247344 is a wasteful number, since it uses less digits than its factorization.

666247344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1982897 (or 1982891 counting only the distinct ones).

The product of its digits is 580608, while the sum is 42.

The square root of 666247344 is about 25811.7675489301. The cubic root of 666247344 is about 873.3972702771.

The spelling of 666247344 in words is "six hundred sixty-six million, two hundred forty-seven thousand, three hundred forty-four".