420664 has 8 divisors (see below), whose sum is σ = 788760. Its totient is φ = 210328.

The previous prime is 420613. The next prime is 420671. The reversal of 420664 is 466024.

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

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, 26284 + ... + 26299.

It is an arithmetic number, because the mean of its divisors is an integer number (98595).

2⁴²⁰⁶⁶⁴ is an apocalyptic number.

It is an amenable number.

420664 is a deficient number, since it is larger than the sum of its proper divisors (368096).

420664 is a wasteful number, since it uses less digits than its factorization.

420664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52589 (or 52585 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 420664 is about 648.5861546472. The cubic root of 420664 is about 74.9281682617.

Adding to 420664 its reverse (466024), we get a palindrome (886688).

The spelling of 420664 in words is "four hundred twenty thousand, six hundred sixty-four".