6401728 has 28 divisors (see below), whose sum is σ = 13258800. Its totient is φ = 3060992.

The previous prime is 6401723. The next prime is 6401749. The reversal of 6401728 is 8271046.

It is a junction number, because it is equal to n+sod(n) for n = 6401696 and 6401705.

It is not an unprimeable number, because it can be changed into a prime (6401723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 703 + ... + 3646.

Almost surely, 2^6401728 is an apocalyptic number.

It is an amenable number.

6401728 is an abundant number, since it is smaller than the sum of its proper divisors (6857072).

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

6401728 is a wasteful number, since it uses less digits than its factorization.

6401728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4384 (or 4374 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 6401728 is about 2530.1636310721. The cubic root of 6401728 is about 185.6802615607.

The spelling of 6401728 in words is "six million, four hundred one thousand, seven hundred twenty-eight".