6498637840 has 40 divisors (see below), whose sum is σ = 15630350040. Its totient is φ = 2509817856.

The previous prime is 6498637807. The next prime is 6498637841. The reversal of 6498637840 is 487368946.

It can be written as a sum of positive squares in 4 ways, for example, as 147185424 + 6351452416 = 12132^2 + 79696^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (6498637841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1398249 + ... + 1402888.

It is an arithmetic number, because the mean of its divisors is an integer number (390758751).

Almost surely, 2^6498637840 is an apocalyptic number.

It is an amenable number.

6498637840 is an abundant number, since it is smaller than the sum of its proper divisors (9131712200).

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

6498637840 is a wasteful number, since it uses less digits than its factorization.

6498637840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2801179 (or 2801173 counting only the distinct ones).

The product of its (nonzero) digits is 6967296, while the sum is 55.

The square root of 6498637840 is about 80614.1292826512. The cubic root of 6498637840 is about 1866.1252032138.

The spelling of 6498637840 in words is "six billion, four hundred ninety-eight million, six hundred thirty-seven thousand, eight hundred forty".