668771244 has 72 divisors (see below), whose sum is σ = 1720358640. Its totient is φ = 219024000.

The previous prime is 668771203. The next prime is 668771249. The reversal of 668771244 is 442177866.

It is a super-3 number, since 3×668771244³ (a number of 27 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 668771244.

It is not an unprimeable number, because it can be changed into a prime (668771249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 513394 + ... + 514694.

It is an arithmetic number, because the mean of its divisors is an integer number (23893870).

Almost surely, 2^668771244 is an apocalyptic number.

It is an amenable number.

668771244 is an abundant number, since it is smaller than the sum of its proper divisors (1051587396).

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

668771244 is a wasteful number, since it uses less digits than its factorization.

668771244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1551 (or 1546 counting only the distinct ones).

The product of its digits is 451584, while the sum is 45.

The square root of 668771244 is about 25860.6118257090. The cubic root of 668771244 is about 874.4987579261.

It can be divided in two parts, 66877 and 1244, that added together give a square (68121 = 261²).

The spelling of 668771244 in words is "six hundred sixty-eight million, seven hundred seventy-one thousand, two hundred forty-four".