6521375028 has 24 divisors (see below), whose sum is σ = 17390333632. Its totient is φ = 1863249984.

The previous prime is 6521375017. The next prime is 6521375033. The reversal of 6521375028 is 8205731256.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38817625 + ... + 38817792.

Almost surely, 2^6521375028 is an apocalyptic number.

It is an amenable number.

6521375028 is an abundant number, since it is smaller than the sum of its proper divisors (10868958604).

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

6521375028 is a wasteful number, since it uses less digits than its factorization.

6521375028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77635431 (or 77635429 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 39.

The square root of 6521375028 is about 80755.0309764042. The cubic root of 6521375028 is about 1868.2990459950.

The spelling of 6521375028 in words is "six billion, five hundred twenty-one million, three hundred seventy-five thousand, twenty-eight".