6678990 has 64 divisors (see below), whose sum is σ = 18446400. Its totient is φ = 1717632.

The previous prime is 6678979. The next prime is 6679009. The reversal of 6678990 is 998766.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7404 + ... + 8256.

It is an arithmetic number, because the mean of its divisors is an integer number (288225).

Almost surely, 2^6678990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6678990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9223200).

6678990 is an abundant number, since it is smaller than the sum of its proper divisors (11767410).

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

6678990 is a wasteful number, since it uses less digits than its factorization.

6678990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 898 (or 892 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 45.

The square root of 6678990 is about 2584.3741989116. The cubic root of 6678990 is about 188.3231014011.

The spelling of 6678990 in words is "six million, six hundred seventy-eight thousand, nine hundred ninety".