6427621220 has 48 divisors (see below), whose sum is σ = 13975223808. Its totient is φ = 2480647680.

The previous prime is 6427621201. The next prime is 6427621231. The reversal of 6427621220 is 221267246.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 193559 + ... + 224321.

It is an arithmetic number, because the mean of its divisors is an integer number (291150496).

Almost surely, 2^6427621220 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 6427621220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6987611904).

6427621220 is an abundant number, since it is smaller than the sum of its proper divisors (7547602588).

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

6427621220 is a wasteful number, since it uses less digits than its factorization.

6427621220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31140 (or 31138 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 6427621220 is about 80172.4467632116. The cubic root of 6427621220 is about 1859.3026657151.

Adding to 6427621220 its reverse (221267246), we get a palindrome (6648888466).

The spelling of 6427621220 in words is "six billion, four hundred twenty-seven million, six hundred twenty-one thousand, two hundred twenty".