6256640 has 96 divisors (see below), whose sum is σ = 16511040. Its totient is φ = 2260992.

The previous prime is 6256639. The next prime is 6256651. The reversal of 6256640 is 466526.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 133097 + ... + 133143.

It is an arithmetic number, because the mean of its divisors is an integer number (171990).

Almost surely, 2^6256640 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 6256640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8255520).

6256640 is an abundant number, since it is smaller than the sum of its proper divisors (10254400).

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

6256640 is a wasteful number, since it uses less digits than its factorization.

6256640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87 (or 67 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 6256640 is about 2501.3276474704. The cubic root of 6256640 is about 184.2667837626.

The spelling of 6256640 in words is "six million, two hundred fifty-six thousand, six hundred forty".