491764572 has 144 divisors (see below), whose sum is σ = 1389373440. Its totient is φ = 145701504.

The previous prime is 491764561. The next prime is 491764591. The reversal of 491764572 is 275467194.

491764572 is a `hidden beast` number, since 4 + 9 + 1 + 76 + 4 + 572 = 666.

Its product of digits (423360) is a multiple of the sum of its prime factors (432).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1737543 + ... + 1737825.

Almost surely, 2^491764572 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 491764572, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (694686720).

491764572 is an abundant number, since it is smaller than the sum of its proper divisors (897608868).

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

491764572 is a wasteful number, since it uses less digits than its factorization.

491764572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432 (or 427 counting only the distinct ones).

The product of its digits is 423360, while the sum is 45.

The square root of 491764572 is about 22175.7654208372. The cubic root of 491764572 is about 789.3187375716.

The spelling of 491764572 in words is "four hundred ninety-one million, seven hundred sixty-four thousand, five hundred seventy-two".