6421580 has 72 divisors (see below), whose sum is σ = 15782256. Its totient is φ = 2176000.

The previous prime is 6421579. The next prime is 6421589. The reversal of 6421580 is 851246.

6421580 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (6421589) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 63530 + ... + 63630.

It is an arithmetic number, because the mean of its divisors is an integer number (219198).

Almost surely, 2^6421580 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 6421580, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7891128).

6421580 is an abundant number, since it is smaller than the sum of its proper divisors (9360676).

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

6421580 is a wasteful number, since it uses less digits than its factorization.

6421580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155 (or 136 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 6421580 is about 2534.0836608131. The cubic root of 6421580 is about 185.8719973354.

It can be divided in two parts, 642 and 1580, that added together give a palindrome (2222).

The spelling of 6421580 in words is "six million, four hundred twenty-one thousand, five hundred eighty".