6403857644 has 6 divisors (see below), whose sum is σ = 11206750884. Its totient is φ = 3201928820.

The previous prime is 6403857637. The next prime is 6403857671. The reversal of 6403857644 is 4467583046.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 800482202 + ... + 800482209.

It is an arithmetic number, because the mean of its divisors is an integer number (1867791814).

Almost surely, 2^6403857644 is an apocalyptic number.

It is an amenable number.

6403857644 is a deficient number, since it is larger than the sum of its proper divisors (4802893240).

6403857644 is a wasteful number, since it uses less digits than its factorization.

6403857644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1600964415 (or 1600964413 counting only the distinct ones).

The product of its (nonzero) digits is 1935360, while the sum is 47.

The square root of 6403857644 is about 80024.1066429360. The cubic root of 6403857644 is about 1857.0084917981.

The spelling of 6403857644 in words is "six billion, four hundred three million, eight hundred fifty-seven thousand, six hundred forty-four".