6421637480 has 32 divisors (see below), whose sum is σ = 15209143200. Its totient is φ = 2433462336.

The previous prime is 6421637471. The next prime is 6421637483. The reversal of 6421637480 is 847361246.

6421637480 = 11543² + 11544² + ... + 11590².

It is not an unprimeable number, because it can be changed into a prime (6421637483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4224002 + ... + 4225521.

It is an arithmetic number, because the mean of its divisors is an integer number (475285725).

Almost surely, 2^6421637480 is an apocalyptic number.

It is an amenable number.

6421637480 is an abundant number, since it is smaller than the sum of its proper divisors (8787505720).

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

6421637480 is a wasteful number, since it uses less digits than its factorization.

6421637480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8449553 (or 8449549 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 41.

The square root of 6421637480 is about 80135.1201409220. The cubic root of 6421637480 is about 1858.7255191803.

The spelling of 6421637480 in words is "six billion, four hundred twenty-one million, six hundred thirty-seven thousand, four hundred eighty".