6440498136 has 96 divisors (see below), whose sum is σ = 18082314000. Its totient is φ = 2124029952.

The previous prime is 6440498101. The next prime is 6440498143. The reversal of 6440498136 is 6318940446.

It is a junction number, because it is equal to n+sod(n) for n = 6440498091 and 6440498100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2030760 + ... + 2033928.

Almost surely, 2^6440498136 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 6440498136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9041157000).

6440498136 is an abundant number, since it is smaller than the sum of its proper divisors (11641815864).

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

6440498136 is a wasteful number, since it uses less digits than its factorization.

6440498136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3378 (or 3271 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 45.

The square root of 6440498136 is about 80252.7141970912. The cubic root of 6440498136 is about 1860.5434624213.

The spelling of 6440498136 in words is "six billion, four hundred forty million, four hundred ninety-eight thousand, one hundred thirty-six".