6742621 has 4 divisors (see below), whose sum is σ = 6924892. Its totient is φ = 6560352.

The previous prime is 6742577. The next prime is 6742643. The reversal of 6742621 is 1262476.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5616900 + 1125721 = 2370^2 + 1061^2 .

It is a cyclic number.

It is not a de Polignac number, because 6742621 - 2⁷ = 6742493 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6742621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6742651) 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 3 ways as a sum of consecutive naturals, for example, 91080 + ... + 91153.

It is an arithmetic number, because the mean of its divisors is an integer number (1731223).

Almost surely, 2^6742621 is an apocalyptic number.

It is an amenable number.

6742621 is a deficient number, since it is larger than the sum of its proper divisors (182271).

6742621 is a wasteful number, since it uses less digits than its factorization.

6742621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182270.

The product of its digits is 4032, while the sum is 28.

The square root of 6742621 is about 2596.6557338238. The cubic root of 6742621 is about 188.9192660231.

The spelling of 6742621 in words is "six million, seven hundred forty-two thousand, six hundred twenty-one".