6469928640 has 756 divisors, whose sum is σ = 27536461056. Its totient is φ = 1389975552.

The previous prime is 6469928593. The next prime is 6469928693. The reversal of 6469928640 is 468299646.

It is an unprimeable number.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 50944257 + ... + 50944383.

Almost surely, 2^6469928640 is an apocalyptic number.

6469928640 is a gapful number since it is divisible by the number (60) 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 6469928640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13768230528).

6469928640 is an abundant number, since it is smaller than the sum of its proper divisors (21066532416).

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

6469928640 is a wasteful number, since it uses less digits than its factorization.

6469928640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202 (or 163 counting only the distinct ones).

The product of its (nonzero) digits is 4478976, while the sum is 54.

The square root of 6469928640 is about 80435.8666267729. The cubic root of 6469928640 is about 1863.3731367876.

It can be divided in two parts, 64699 and 28640, that added together give a palindrome (93339).

The spelling of 6469928640 in words is "six billion, four hundred sixty-nine million, nine hundred twenty-eight thousand, six hundred forty".