668062644 has 24 divisors (see below), whose sum is σ = 1559519808. Its totient is φ = 222586560.

The previous prime is 668062627. The next prime is 668062649. The reversal of 668062644 is 446260866.

It is a junction number, because it is equal to n+sod(n) for n = 668062596 and 668062605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668062649) 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 7 ways as a sum of consecutive naturals, for example, 17889 + ... + 40695.

It is an arithmetic number, because the mean of its divisors is an integer number (64979992).

Almost surely, 2^668062644 is an apocalyptic number.

It is an amenable number.

668062644 is an abundant number, since it is smaller than the sum of its proper divisors (891457164).

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

668062644 is a wasteful number, since it uses less digits than its factorization.

668062644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25255 (or 25253 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 42.

The square root of 668062644 is about 25846.9078227938. The cubic root of 668062644 is about 874.1897888964.

The spelling of 668062644 in words is "six hundred sixty-eight million, sixty-two thousand, six hundred forty-four".