4128640 has 32 divisors (see below), whose sum is σ = 9871560. Its totient is φ = 1651200.

The previous prime is 4128623. The next prime is 4128689. The reversal of 4128640 is 468214.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2586 + ... + 3865.

Almost surely, 2^4128640 is an apocalyptic number.

4128640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

4128640 is an abundant number, since it is smaller than the sum of its proper divisors (5742920).

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

4128640 is an equidigital number, since it uses as much as digits as its factorization.

4128640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6470 (or 6458 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 4128640 is about 2031.9055096141. The cubic root of 4128640 is about 160.4238760651.

The spelling of 4128640 in words is "four million, one hundred twenty-eight thousand, six hundred forty".