6534950640 has 80 divisors (see below), whose sum is σ = 20752484256. Its totient is φ = 1700147200.

The previous prime is 6534950563. The next prime is 6534950657. The reversal of 6534950640 is 460594356.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 6534950592 and 6534950601.

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, 322221 + ... + 341900.

Almost surely, 2^6534950640 is an apocalyptic number.

6534950640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6534950640 is an abundant number, since it is smaller than the sum of its proper divisors (14217533616).

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

6534950640 is a wasteful number, since it uses less digits than its factorization.

6534950640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664178 (or 664172 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 42.

The square root of 6534950640 is about 80839.0415579007. The cubic root of 6534950640 is about 1869.5945664174.

The spelling of 6534950640 in words is "six billion, five hundred thirty-four million, nine hundred fifty thousand, six hundred forty".