6428240 has 80 divisors (see below), whose sum is σ = 18415488. Its totient is φ = 2032128.

The previous prime is 6428207. The next prime is 6428263. The reversal of 6428240 is 428246.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (26).

It is an Ulam number.

It is a congruent number.

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, 6839 + ... + 7721.

Almost surely, 2^6428240 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 6428240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9207744).

6428240 is an abundant number, since it is smaller than the sum of its proper divisors (11987248).

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

6428240 is a wasteful number, since it uses less digits than its factorization.

6428240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 916 (or 910 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 26.

The square root of 6428240 is about 2535.3974047474. The cubic root of 6428240 is about 185.9362328139.

The spelling of 6428240 in words is "six million, four hundred twenty-eight thousand, two hundred forty".