668420024 has 8 divisors (see below), whose sum is σ = 1253287560. Its totient is φ = 334210008.

The previous prime is 668420017. The next prime is 668420029. The reversal of 668420024 is 420024866.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668420029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41776244 + ... + 41776259.

It is an arithmetic number, because the mean of its divisors is an integer number (156660945).

Almost surely, 2^668420024 is an apocalyptic number.

It is an amenable number.

668420024 is a deficient number, since it is larger than the sum of its proper divisors (584867536).

668420024 is a wasteful number, since it uses less digits than its factorization.

668420024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83552509 (or 83552505 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 32.

The square root of 668420024 is about 25853.8202979753. The cubic root of 668420024 is about 874.3456436688.

The spelling of 668420024 in words is "six hundred sixty-eight million, four hundred twenty thousand, twenty-four".