6555978 has 80 divisors (see below), whose sum is σ = 17319456. Its totient is φ = 1827360.

The previous prime is 6555971. The next prime is 6556003. The reversal of 6555978 is 8795556.

6555978 is a `hidden beast` number, since 6 + 55 + 597 + 8 = 666.

It is not an unprimeable number, because it can be changed into a prime (6555971) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 23025 + ... + 23307.

Almost surely, 2^6555978 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6555978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8659728).

6555978 is an abundant number, since it is smaller than the sum of its proper divisors (10763478).

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

6555978 is a wasteful number, since it uses less digits than its factorization.

6555978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321 (or 312 counting only the distinct ones).

The product of its digits is 378000, while the sum is 45.

The square root of 6555978 is about 2560.4644110005. The cubic root of 6555978 is about 187.1597669948.

The spelling of 6555978 in words is "six million, five hundred fifty-five thousand, nine hundred seventy-eight".