6440088 has 64 divisors (see below), whose sum is σ = 17568000. Its totient is φ = 1959552.

The previous prime is 6440041. The next prime is 6440089. The reversal of 6440088 is 8800446.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6440089) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12981 + ... + 13467.

It is an arithmetic number, because the mean of its divisors is an integer number (274500).

Almost surely, 2^6440088 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6440088, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8784000).

6440088 is an abundant number, since it is smaller than the sum of its proper divisors (11127912).

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

6440088 is a wasteful number, since it uses less digits than its factorization.

6440088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 544 (or 540 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 30.

The square root of 6440088 is about 2537.7328464596. The cubic root of 6440088 is about 186.0503967958.

The spelling of 6440088 in words is "six million, four hundred forty thousand, eighty-eight".