494720128 has 64 divisors (see below), whose sum is σ = 1192665600. Its totient is φ = 199544832.

The previous prime is 494720123. The next prime is 494720129. The reversal of 494720128 is 821027494.

It is a tau number, because it is divible by the number of its divisors (64).

It is not an unprimeable number, because it can be changed into a prime (494720123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1008 + ... + 31471.

It is an arithmetic number, because the mean of its divisors is an integer number (18635400).

Almost surely, 2^494720128 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 494720128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (596332800).

494720128 is an abundant number, since it is smaller than the sum of its proper divisors (697945472).

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

494720128 is a wasteful number, since it uses less digits than its factorization.

494720128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32517 (or 32505 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 494720128 is about 22242.3049165324. The cubic root of 494720128 is about 790.8968759721.

The spelling of 494720128 in words is "four hundred ninety-four million, seven hundred twenty thousand, one hundred twenty-eight".