6401628 has 18 divisors (see below), whose sum is σ = 16181984. Its totient is φ = 2133864.

The previous prime is 6401621. The next prime is 6401669. The reversal of 6401628 is 8261046.

6401628 is a `hidden beast` number, since 640 + 16 + 2 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6401621) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 88876 + ... + 88947.

Almost surely, 2^6401628 is an apocalyptic number.

It is an amenable number.

6401628 is an abundant number, since it is smaller than the sum of its proper divisors (9780356).

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

6401628 is a wasteful number, since it uses less digits than its factorization.

6401628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177833 (or 177828 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 6401628 is about 2530.1438694272. The cubic root of 6401628 is about 185.6792947320.

The spelling of 6401628 in words is "six million, four hundred one thousand, six hundred twenty-eight".