420847780 has 48 divisors (see below), whose sum is σ = 909313776. Its totient is φ = 163512320.

The previous prime is 420847771. The next prime is 420847781. The reversal of 420847780 is 87748024.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 45805824 + 375041956 = 6768^2 + 19366^2 .

It is a super-2 number, since 2×420847780² = 354225707861856800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (420847781) 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 15 ways as a sum of consecutive naturals, for example, 209742 + ... + 211738.

It is an arithmetic number, because the mean of its divisors is an integer number (18944037).

Almost surely, 2^420847780 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 420847780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (454656888).

420847780 is an abundant number, since it is smaller than the sum of its proper divisors (488465996).

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

420847780 is a wasteful number, since it uses less digits than its factorization.

420847780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2304 (or 2302 counting only the distinct ones).

The product of its (nonzero) digits is 100352, while the sum is 40.

The square root of 420847780 is about 20514.5748188940. The cubic root of 420847780 is about 749.3907823094.

The spelling of 420847780 in words is "four hundred twenty million, eight hundred forty-seven thousand, seven hundred eighty".