6783990 has 16 divisors (see below), whose sum is σ = 16281648. Its totient is φ = 1809056.

The previous prime is 6783971. The next prime is 6783991. The reversal of 6783990 is 993876.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6783991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 113037 + ... + 113096.

It is an arithmetic number, because the mean of its divisors is an integer number (1017603).

Almost surely, 2^6783990 is an apocalyptic number.

6783990 is an abundant number, since it is smaller than the sum of its proper divisors (9497658).

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

6783990 is a wasteful number, since it uses less digits than its factorization.

6783990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226143.

The product of its (nonzero) digits is 81648, while the sum is 42.

The square root of 6783990 is about 2604.6093757030. The cubic root of 6783990 is about 189.3048466311.

The spelling of 6783990 in words is "six million, seven hundred eighty-three thousand, nine hundred ninety".