668126072 has 8 divisors (see below), whose sum is σ = 1252736400. Its totient is φ = 334063032.

The previous prime is 668126033. The next prime is 668126101. The reversal of 668126072 is 270621866.

It is a happy number.

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

It is a super-2 number, since 2×668126072² = 892784896172298368, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 41757872 + ... + 41757887.

It is an arithmetic number, because the mean of its divisors is an integer number (156592050).

Almost surely, 2^668126072 is an apocalyptic number.

It is an amenable number.

668126072 is a deficient number, since it is larger than the sum of its proper divisors (584610328).

668126072 is a wasteful number, since it uses less digits than its factorization.

668126072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83515765 (or 83515761 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 668126072 is about 25848.1347876399. The cubic root of 668126072 is about 874.2174541440.

The spelling of 668126072 in words is "six hundred sixty-eight million, one hundred twenty-six thousand, seventy-two".