6388750640 has 20 divisors (see below), whose sum is σ = 14853845424. Its totient is φ = 2555500224.

The previous prime is 6388750633. The next prime is 6388750727. The reversal of 6388750640 is 460578836.

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×6388750640² = 81632269480200819200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39929612 + ... + 39929771.

Almost surely, 2^6388750640 is an apocalyptic number.

It is an amenable number.

6388750640 is an abundant number, since it is smaller than the sum of its proper divisors (8465094784).

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

6388750640 is a wasteful number, since it uses less digits than its factorization.

6388750640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79859396 (or 79859390 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 47.

The square root of 6388750640 is about 79929.6605772851. The cubic root of 6388750640 is about 1855.5470849743.

The spelling of 6388750640 in words is "six billion, three hundred eighty-eight million, seven hundred fifty thousand, six hundred forty".