8420273820 has 144 divisors (see below), whose sum is σ = 29212904448. Its totient is φ = 1923143040.

The previous prime is 8420273809. The next prime is 8420273867. The reversal of 8420273820 is 283720248.

It is a super-2 number, since 2×8420273820² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3081855 + ... + 3084585.

It is an arithmetic number, because the mean of its divisors is an integer number (202867392).

Almost surely, 2^8420273820 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 8420273820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14606452224).

8420273820 is an abundant number, since it is smaller than the sum of its proper divisors (20792630628).

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

8420273820 is a wasteful number, since it uses less digits than its factorization.

8420273820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5200 (or 5195 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 36.

The square root of 8420273820 is about 91762.0499988966. The cubic root of 8420273820 is about 2034.4268152899.

The spelling of 8420273820 in words is "eight billion, four hundred twenty million, two hundred seventy-three thousand, eight hundred twenty".