489391578 has 64 divisors (see below), whose sum is σ = 1183432320. Its totient is φ = 149008896.

The previous prime is 489391577. The next prime is 489391603. The reversal of 489391578 is 875193984.

489391578 is a `hidden beast` number, since 489 + 3 + 9 + 157 + 8 = 666.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (489391577) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 64501 + ... + 71687.

It is an arithmetic number, because the mean of its divisors is an integer number (18491130).

Almost surely, 2^489391578 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 489391578, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (591716160).

489391578 is an abundant number, since it is smaller than the sum of its proper divisors (694040742).

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

489391578 is a wasteful number, since it uses less digits than its factorization.

489391578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7308 (or 7302 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 54.

The square root of 489391578 is about 22122.1965003478. The cubic root of 489391578 is about 788.0470792644.

The spelling of 489391578 in words is "four hundred eighty-nine million, three hundred ninety-one thousand, five hundred seventy-eight".