421685768 has 24 divisors (see below), whose sum is σ = 919749150. Its totient is φ = 180722304.

The previous prime is 421685767. The next prime is 421685783. The reversal of 421685768 is 867586124.

It can be written as a sum of positive squares in only one way, i.e., 402483844 + 19201924 = 20062^2 + 4382^2 .

It is not an unprimeable number, because it can be changed into a prime (421685767) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 537473 + ... + 538256.

Almost surely, 2^421685768 is an apocalyptic number.

It is an amenable number.

421685768 is an abundant number, since it is smaller than the sum of its proper divisors (498063382).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

421685768 is a wasteful number, since it uses less digits than its factorization.

421685768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1075749 (or 1075738 counting only the distinct ones).

The product of its digits is 645120, while the sum is 47.

The square root of 421685768 is about 20534.9888726534. The cubic root of 421685768 is about 749.8878457479.

The spelling of 421685768 in words is "four hundred twenty-one million, six hundred eighty-five thousand, seven hundred sixty-eight".