4394744640 has 448 divisors, whose sum is σ = 18219237120. Its totient is φ = 983162880.

The previous prime is 4394744611. The next prime is 4394744659. The reversal of 4394744640 is 464474934.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1233742 + ... + 1237298.

It is an arithmetic number, because the mean of its divisors is an integer number (40667940).

Almost surely, 2^4394744640 is an apocalyptic number.

4394744640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 4394744640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9109618560).

4394744640 is an abundant number, since it is smaller than the sum of its proper divisors (13824492480).

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

4394744640 is a wasteful number, since it uses less digits than its factorization.

4394744640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3607 (or 3591 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 45.

The square root of 4394744640 is about 66292.8702048720. The cubic root of 4394744640 is about 1637.9898830703.

The spelling of 4394744640 in words is "four billion, three hundred ninety-four million, seven hundred forty-four thousand, six hundred forty".