6400679616 has 140 divisors (see below), whose sum is σ = 19586163520. Its totient is φ = 2064683520.

The previous prime is 6400679603. The next prime is 6400679633. The reversal of 6400679616 is 6169760046.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 140790 + ... + 180618.

It is an arithmetic number, because the mean of its divisors is an integer number (139901168).

Almost surely, 2^6400679616 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6400679616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9793081760).

6400679616 is an abundant number, since it is smaller than the sum of its proper divisors (13185483904).

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

6400679616 is a wasteful number, since it uses less digits than its factorization.

6400679616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39884 (or 39865 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 45.

The square root of 6400679616 is about 80004.2474872428. The cubic root of 6400679616 is about 1856.7012498281.

The spelling of 6400679616 in words is "six billion, four hundred million, six hundred seventy-nine thousand, six hundred sixteen".