6642480 has 80 divisors (see below), whose sum is σ = 22186080. Its totient is φ = 1634304.

The previous prime is 6642439. The next prime is 6642487. The reversal of 6642480 is 842466.

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 (30).

It is not an unprimeable number, because it can be changed into a prime (6642487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2056 + ... + 4184.

It is an arithmetic number, because the mean of its divisors is an integer number (277326).

Almost surely, 2^6642480 is an apocalyptic number.

6642480 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6642480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11093040).

6642480 is an abundant number, since it is smaller than the sum of its proper divisors (15543600).

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

6642480 is a wasteful number, since it uses less digits than its factorization.

6642480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2158 (or 2152 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 30.

The square root of 6642480 is about 2577.3009137468. The cubic root of 6642480 is about 187.9793247219.

The spelling of 6642480 in words is "six million, six hundred forty-two thousand, four hundred eighty".