6687742 has 4 divisors (see below), whose sum is σ = 10031616. Its totient is φ = 3343870.

The previous prime is 6687701. The next prime is 6687757. The reversal of 6687742 is 2477866.

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

It is a d-powerful number, because it can be written as 6² + 6⁷ + 8 + 7⁶ + 7⁸ + 4⁵ + 2¹⁹ .

It is a junction number, because it is equal to n+sod(n) for n = 6687695 and 6687704.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1671934 + ... + 1671937.

It is an arithmetic number, because the mean of its divisors is an integer number (2507904).

Almost surely, 2^6687742 is an apocalyptic number.

6687742 is a deficient number, since it is larger than the sum of its proper divisors (3343874).

6687742 is a wasteful number, since it uses less digits than its factorization.

6687742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3343873.

The product of its digits is 112896, while the sum is 40.

The square root of 6687742 is about 2586.0668978199. The cubic root of 6687742 is about 188.4053236325.

The spelling of 6687742 in words is "six million, six hundred eighty-seven thousand, seven hundred forty-two".