420717646 has 16 divisors (see below), whose sum is σ = 680495760. Its totient is φ = 194425920.

The previous prime is 420717643. The next prime is 420717653. The reversal of 420717646 is 646717024.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420717643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 133461 + ... + 136576.

It is an arithmetic number, because the mean of its divisors is an integer number (42530985).

Almost surely, 2^420717646 is an apocalyptic number.

420717646 is a deficient number, since it is larger than the sum of its proper divisors (259778114).

420717646 is a wasteful number, since it uses less digits than its factorization.

420717646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270099.

The product of its (nonzero) digits is 56448, while the sum is 37.

The square root of 420717646 is about 20511.4028286707. The cubic root of 420717646 is about 749.3135324674.

The spelling of 420717646 in words is "four hundred twenty million, seven hundred seventeen thousand, six hundred forty-six".