421728863 has 4 divisors (see below), whose sum is σ = 421882440. Its totient is φ = 421575288.

The previous prime is 421728859. The next prime is 421728871. The reversal of 421728863 is 368827124.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 421728863 - 2² = 421728859 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 421728863.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421728823) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72593 + ... + 78186.

It is an arithmetic number, because the mean of its divisors is an integer number (105470610).

Almost surely, 2^421728863 is an apocalyptic number.

421728863 is a deficient number, since it is larger than the sum of its proper divisors (153577).

421728863 is a wasteful number, since it uses less digits than its factorization.

421728863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153576.

The product of its digits is 129024, while the sum is 41.

The square root of 421728863 is about 20536.0381524772. The cubic root of 421728863 is about 749.9133902950.

The spelling of 421728863 in words is "four hundred twenty-one million, seven hundred twenty-eight thousand, eight hundred sixty-three".