420644530 has 8 divisors (see below), whose sum is σ = 757160172. Its totient is φ = 168257808.

The previous prime is 420644519. The next prime is 420644531. The reversal of 420644530 is 35446024.

It can be written as a sum of positive squares in 2 ways, for example, as 413837649 + 6806881 = 20343^2 + 2609^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (420644531) 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, 21032217 + ... + 21032236.

Almost surely, 2^420644530 is an apocalyptic number.

420644530 is a deficient number, since it is larger than the sum of its proper divisors (336515642).

420644530 is a wasteful number, since it uses less digits than its factorization.

420644530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42064460.

The product of its (nonzero) digits is 11520, while the sum is 28.

The square root of 420644530 is about 20509.6204255466. The cubic root of 420644530 is about 749.2701225282.

The spelling of 420644530 in words is "four hundred twenty million, six hundred forty-four thousand, five hundred thirty".