420720668 has 6 divisors (see below), whose sum is σ = 736261176. Its totient is φ = 210360332.

The previous prime is 420720659. The next prime is 420720679. The reversal of 420720668 is 866027024.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52590080 + ... + 52590087.

It is an arithmetic number, because the mean of its divisors is an integer number (122710196).

Almost surely, 2^420720668 is an apocalyptic number.

It is an amenable number.

420720668 is a deficient number, since it is larger than the sum of its proper divisors (315540508).

420720668 is a wasteful number, since it uses less digits than its factorization.

420720668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105180171 (or 105180169 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 35.

The square root of 420720668 is about 20511.4764948796. The cubic root of 420720668 is about 749.3153265606.

The spelling of 420720668 in words is "four hundred twenty million, seven hundred twenty thousand, six hundred sixty-eight".