6627981 has 4 divisors (see below), whose sum is σ = 8837312. Its totient is φ = 4418652.

The previous prime is 6627949. The next prime is 6627989. The reversal of 6627981 is 1897266.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 6627981 - 2⁵ = 6627949 is a prime.

It is a super-2 number, since 2×6627981² = 87860264272722, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a plaindrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6627989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1104661 + ... + 1104666.

It is an arithmetic number, because the mean of its divisors is an integer number (2209328).

Almost surely, 2^6627981 is an apocalyptic number.

It is an amenable number.

6627981 is a deficient number, since it is larger than the sum of its proper divisors (2209331).

6627981 is a wasteful number, since it uses less digits than its factorization.

6627981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2209330.

The product of its digits is 36288, while the sum is 39.

The square root of 6627981 is about 2574.4865507514. The cubic root of 6627981 is about 187.8424532677.

The spelling of 6627981 in words is "six million, six hundred twenty-seven thousand, nine hundred eighty-one".