6437889964 has 24 divisors (see below), whose sum is σ = 12339504576. Its totient is φ = 2914650000.

The previous prime is 6437889923. The next prime is 6437889967. The reversal of 6437889964 is 4699887346.

It is a junction number, because it is equal to n+sod(n) for n = 6437889896 and 6437889905.

It is not an unprimeable number, because it can be changed into a prime (6437889967) 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, 280422 + ... + 302509.

It is an arithmetic number, because the mean of its divisors is an integer number (514146024).

Almost surely, 2^6437889964 is an apocalyptic number.

It is an amenable number.

6437889964 is a deficient number, since it is larger than the sum of its proper divisors (5901614612).

6437889964 is a wasteful number, since it uses less digits than its factorization.

6437889964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 583197 (or 583195 counting only the distinct ones).

The product of its digits is 62705664, while the sum is 64.

The square root of 6437889964 is about 80236.4628083766. The cubic root of 6437889964 is about 1860.2922772669.

The spelling of 6437889964 in words is "six billion, four hundred thirty-seven million, eight hundred eighty-nine thousand, nine hundred sixty-four".