660638344 has 8 divisors (see below), whose sum is σ = 1238696910. Its totient is φ = 330319168.

The previous prime is 660638339. The next prime is 660638347. The reversal of 660638344 is 443836066.

It can be written as a sum of positive squares in only one way, i.e., 589032900 + 71605444 = 24270^2 + 8462^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-3 number, since 3×660638344³ (a number of 27 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 660638297 and 660638306.

It is not an unprimeable number, because it can be changed into a prime (660638347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41289889 + ... + 41289904.

Almost surely, 2^660638344 is an apocalyptic number.

It is an amenable number.

660638344 is a deficient number, since it is larger than the sum of its proper divisors (578058566).

660638344 is a wasteful number, since it uses less digits than its factorization.

660638344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82579799 (or 82579795 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 40.

The square root of 660638344 is about 25702.8859080065. The cubic root of 660638344 is about 870.9393755398.

The spelling of 660638344 in words is "six hundred sixty million, six hundred thirty-eight thousand, three hundred forty-four".