6440226520 has 64 divisors (see below), whose sum is σ = 17834483520. Its totient is φ = 2038224384.

The previous prime is 6440226473. The next prime is 6440226563. The reversal of 6440226520 is 256220446.

It is a super-2 number, since 2×6440226520² = 82953035257822620800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 881007 + ... + 888286.

It is an arithmetic number, because the mean of its divisors is an integer number (278663805).

Almost surely, 2^6440226520 is an apocalyptic number.

It is an amenable number.

6440226520 is an abundant number, since it is smaller than the sum of its proper divisors (11394257000).

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

6440226520 is a wasteful number, since it uses less digits than its factorization.

6440226520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1769324 (or 1769320 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 31.

The square root of 6440226520 is about 80251.0219249574. The cubic root of 6440226520 is about 1860.5173070699.

Adding to 6440226520 its reverse (256220446), we get a palindrome (6696446966).

The spelling of 6440226520 in words is "six billion, four hundred forty million, two hundred twenty-six thousand, five hundred twenty".