6438972500 has 30 divisors (see below), whose sum is σ = 14080750530. Its totient is φ = 2575588000.

The previous prime is 6438972497. The next prime is 6438972511. The reversal of 6438972500 is 52798346.

It can be written as a sum of positive squares in 5 ways, for example, as 1623445264 + 4815527236 = 40292^2 + 69394^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1285295 + ... + 1290294.

It is an arithmetic number, because the mean of its divisors is an integer number (469358351).

Almost surely, 2^6438972500 is an apocalyptic number.

It is an amenable number.

6438972500 is an abundant number, since it is smaller than the sum of its proper divisors (7641778030).

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

6438972500 is a wasteful number, since it uses less digits than its factorization.

6438972500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2575613 (or 2575596 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 44.

The square root of 6438972500 is about 80243.2084353561. The cubic root of 6438972500 is about 1860.3965412678.

The spelling of 6438972500 in words is "six billion, four hundred thirty-eight million, nine hundred seventy-two thousand, five hundred".