6642405 has 96 divisors (see below), whose sum is σ = 15095808. Its totient is φ = 2721600.

The previous prime is 6642403. The next prime is 6642409. The reversal of 6642405 is 5042466.

It is a happy number.

It is not a de Polignac number, because 6642405 - 2¹ = 6642403 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6642403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 93520 + ... + 93590.

It is an arithmetic number, because the mean of its divisors is an integer number (157248).

Almost surely, 2^6642405 is an apocalyptic number.

It is an amenable number.

6642405 is an abundant number, since it is smaller than the sum of its proper divisors (8453403).

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

6642405 is a wasteful number, since it uses less digits than its factorization.

6642405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109 (or 97 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 6642405 is about 2577.2863636003. The cubic root of 6642405 is about 187.9786172300.

It can be divided in two parts, 6 and 642405, that added together give a triangular number (642411 = T₁₁₃₃).

The spelling of 6642405 in words is "six million, six hundred forty-two thousand, four hundred five".