668070972 has 72 divisors (see below), whose sum is σ = 1799755776. Its totient is φ = 208463904.

The previous prime is 668070967. The next prime is 668070973. The reversal of 668070972 is 279070866.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668070973) 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, 30333 + ... + 47499.

It is an arithmetic number, because the mean of its divisors is an integer number (24996608).

Almost surely, 2^668070972 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 668070972, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (899877888).

668070972 is an abundant number, since it is smaller than the sum of its proper divisors (1131684804).

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

668070972 is a wasteful number, since it uses less digits than its factorization.

668070972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17247 (or 17242 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 45.

The square root of 668070972 is about 25847.0689247350. The cubic root of 668070972 is about 874.1934214013.

The spelling of 668070972 in words is "six hundred sixty-eight million, seventy thousand, nine hundred seventy-two".