6549978 has 8 divisors (see below), whose sum is σ = 13099968. Its totient is φ = 2183324.

The previous prime is 6549973. The next prime is 6549979. The reversal of 6549978 is 8799456.

It is a sphenic number, since it is the product of 3 distinct primes.

6549978 is an admirable number.

It is a super-3 number, since 3×6549978³ (a number of 21 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6549973) 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, 545826 + ... + 545837.

It is an arithmetic number, because the mean of its divisors is an integer number (1637496).

Almost surely, 2^6549978 is an apocalyptic number.

6549978 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

6549978 is a wasteful number, since it uses less digits than its factorization.

6549978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1091668.

The product of its digits is 544320, while the sum is 48.

The square root of 6549978 is about 2559.2924803547. The cubic root of 6549978 is about 187.1026536573.

The spelling of 6549978 in words is "six million, five hundred forty-nine thousand, nine hundred seventy-eight".