6445264280 has 128 divisors (see below), whose sum is σ = 18185731200. Its totient is φ = 2001272832.

The previous prime is 6445264279. The next prime is 6445264283. The reversal of 6445264280 is 824625446.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6445264283) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 176216 + ... + 209624.

It is an arithmetic number, because the mean of its divisors is an integer number (142076025).

Almost surely, 2^6445264280 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 6445264280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9092865600).

6445264280 is an abundant number, since it is smaller than the sum of its proper divisors (11740466920).

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

6445264280 is a wasteful number, since it uses less digits than its factorization.

6445264280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33493 (or 33489 counting only the distinct ones).

The product of its (nonzero) digits is 368640, while the sum is 41.

The square root of 6445264280 is about 80282.4033023427. The cubic root of 6445264280 is about 1861.0023001978.

The spelling of 6445264280 in words is "six billion, four hundred forty-five million, two hundred sixty-four thousand, two hundred eighty".