6439889346 has 96 divisors (see below), whose sum is σ = 14680748544. Its totient is φ = 1879891200.

The previous prime is 6439889333. The next prime is 6439889359.

6439889346 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (6439889333) and next prime (6439889359).

It is a self number, because there is not a number n which added to its sum of digits gives 6439889346.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6233646 + ... + 6234678.

It is an arithmetic number, because the mean of its divisors is an integer number (152924464).

Almost surely, 2^6439889346 is an apocalyptic number.

6439889346 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 6439889346, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7340374272).

6439889346 is an abundant number, since it is smaller than the sum of its proper divisors (8240859198).

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

6439889346 is a wasteful number, since it uses less digits than its factorization.

6439889346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1368 (or 1357 counting only the distinct ones).

The product of its digits is 26873856, while the sum is 60.

The square root of 6439889346 is about 80248.9211516267. The cubic root of 6439889346 is about 1860.4848377663.

The spelling of 6439889346 in words is "six billion, four hundred thirty-nine million, eight hundred eighty-nine thousand, three hundred forty-six".