6420280 has 16 divisors (see below), whose sum is σ = 14445720. Its totient is φ = 2568096.

The previous prime is 6420259. The next prime is 6420307. The reversal of 6420280 is 820246.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80214 + ... + 80293.

Almost surely, 2^6420280 is an apocalyptic number.

It is an amenable number.

6420280 is an abundant number, since it is smaller than the sum of its proper divisors (8025440).

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

6420280 is a wasteful number, since it uses less digits than its factorization.

6420280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160518 (or 160514 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 6420280 is about 2533.8271448542. The cubic root of 6420280 is about 185.8594536985.

The spelling of 6420280 in words is "six million, four hundred twenty thousand, two hundred eighty".