420531778 has 8 divisors (see below), whose sum is σ = 632387772. Its totient is φ = 209735856.

The previous prime is 420531739. The next prime is 420531779. The reversal of 420531778 is 877135024.

It can be written as a sum of positive squares in 2 ways, for example, as 401321089 + 19210689 = 20033^2 + 4383^2 .

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 (420531779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 264025 + ... + 265612.

Almost surely, 2^420531778 is an apocalyptic number.

420531778 is a deficient number, since it is larger than the sum of its proper divisors (211855994).

420531778 is a wasteful number, since it uses less digits than its factorization.

420531778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 530036.

The product of its (nonzero) digits is 47040, while the sum is 37.

The square root of 420531778 is about 20506.8714825056. The cubic root of 420531778 is about 749.2031703090.

The spelling of 420531778 in words is "four hundred twenty million, five hundred thirty-one thousand, seven hundred seventy-eight".