6421280280 has 96 divisors (see below), whose sum is σ = 20331226800. Its totient is φ = 1622207232.

The previous prime is 6421280269. The next prime is 6421280293. The reversal of 6421280280 is 820821246.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30795 + ... + 117434.

Almost surely, 2^6421280280 is an apocalyptic number.

6421280280 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6421280280 is an abundant number, since it is smaller than the sum of its proper divisors (13909946520).

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

6421280280 is a wasteful number, since it uses less digits than its factorization.

6421280280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148281 (or 148258 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 33.

The square root of 6421280280 is about 80132.8913742665. The cubic root of 6421280280 is about 1858.6910550182.

The spelling of 6421280280 in words is "six billion, four hundred twenty-one million, two hundred eighty thousand, two hundred eighty".