661307244 has 24 divisors (see below), whose sum is σ = 1661746800. Its totient is φ = 203479104.

The previous prime is 661307243. The next prime is 661307261. The reversal of 661307244 is 442703166.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (661307243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2119419 + ... + 2119730.

It is an arithmetic number, because the mean of its divisors is an integer number (69239450).

Almost surely, 2^661307244 is an apocalyptic number.

It is an amenable number.

661307244 is an abundant number, since it is smaller than the sum of its proper divisors (1000439556).

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

661307244 is a wasteful number, since it uses less digits than its factorization.

661307244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4239169 (or 4239167 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 33.

The square root of 661307244 is about 25715.8947734665. The cubic root of 661307244 is about 871.2332200440.

The spelling of 661307244 in words is "six hundred sixty-one million, three hundred seven thousand, two hundred forty-four".