6677978 has 4 divisors (see below), whose sum is σ = 10016970. Its totient is φ = 3338988.

The previous prime is 6677971. The next prime is 6678017. The reversal of 6677978 is 8797766.

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

It can be written as a sum of positive squares in only one way, i.e., 4566769 + 2111209 = 2137^2 + 1453^2 .

It is a super-3 number, since 3×6677978³ (a number of 21 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (6677971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1669493 + ... + 1669496.

Almost surely, 2^6677978 is an apocalyptic number.

6677978 is a deficient number, since it is larger than the sum of its proper divisors (3338992).

6677978 is a wasteful number, since it uses less digits than its factorization.

6677978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3338991.

The product of its digits is 889056, while the sum is 50.

The square root of 6677978 is about 2584.1783994144. The cubic root of 6677978 is about 188.3135893539.

The spelling of 6677978 in words is "six million, six hundred seventy-seven thousand, nine hundred seventy-eight".