4644389857 has 4 divisors (see below), whose sum is σ = 4673972116. Its totient is φ = 4614807600.

The previous prime is 4644389843. The next prime is 4644389863. The reversal of 4644389857 is 7589834464.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3298894096 + 1345495761 = 57436^2 + 36681^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4644389857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4644389257) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14790894 + ... + 14791207.

It is an arithmetic number, because the mean of its divisors is an integer number (1168493029).

Almost surely, 2^4644389857 is an apocalyptic number.

It is an amenable number.

4644389857 is a deficient number, since it is larger than the sum of its proper divisors (29582259).

4644389857 is a wasteful number, since it uses less digits than its factorization.

4644389857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29582258.

The product of its digits is 23224320, while the sum is 58.

The square root of 4644389857 is about 68149.7605058154. The cubic root of 4644389857 is about 1668.4360149305.

The spelling of 4644389857 in words is "four billion, six hundred forty-four million, three hundred eighty-nine thousand, eight hundred fifty-seven".