6428889 has 20 divisors (see below), whose sum is σ = 9689680. Its totient is φ = 4247640.

The previous prime is 6428879. The next prime is 6428921. The reversal of 6428889 is 9888246.

It is a happy number.

It is not a de Polignac number, because 6428889 - 2⁵ = 6428857 is a prime.

It is a super-2 number, since 2×6428889² = 82661227548642, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6428809) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 10974 + ... + 11544.

It is an arithmetic number, because the mean of its divisors is an integer number (484484).

Almost surely, 2^6428889 is an apocalyptic number.

It is an amenable number.

6428889 is a deficient number, since it is larger than the sum of its proper divisors (3260791).

6428889 is a wasteful number, since it uses less digits than its factorization.

6428889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 722 (or 713 counting only the distinct ones).

The product of its digits is 221184, while the sum is 45.

The square root of 6428889 is about 2535.5253893424. The cubic root of 6428889 is about 185.9424900245.

The spelling of 6428889 in words is "six million, four hundred twenty-eight thousand, eight hundred eighty-nine".