6665428 has 96 divisors (see below), whose sum is σ = 16450560. Its totient is φ = 2280960.

The previous prime is 6665413. The next prime is 6665437. The reversal of 6665428 is 8245666.

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, 99451 + ... + 99517.

It is an arithmetic number, because the mean of its divisors is an integer number (171360).

Almost surely, 2^6665428 is an apocalyptic number.

6665428 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6665428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8225280).

6665428 is an abundant number, since it is smaller than the sum of its proper divisors (9785132).

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

6665428 is a wasteful number, since it uses less digits than its factorization.

6665428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125 (or 123 counting only the distinct ones).

The product of its digits is 69120, while the sum is 37.

The square root of 6665428 is about 2581.7490195602. The cubic root of 6665428 is about 188.1955487546.

The spelling of 6665428 in words is "six million, six hundred sixty-five thousand, four hundred twenty-eight".