6428990 has 8 divisors (see below), whose sum is σ = 11572200. Its totient is φ = 2571592.

The previous prime is 6428987. The next prime is 6429019. The reversal of 6428990 is 998246.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 321440 + ... + 321459.

It is an arithmetic number, because the mean of its divisors is an integer number (1446525).

Almost surely, 2^6428990 is an apocalyptic number.

6428990 is a deficient number, since it is larger than the sum of its proper divisors (5143210).

6428990 is a wasteful number, since it uses less digits than its factorization.

6428990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 642906.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 6428990 is about 2535.5453062408. The cubic root of 6428990 is about 185.9434637590.

The spelling of 6428990 in words is "six million, four hundred twenty-eight thousand, nine hundred ninety".