491978793744 has 45 divisors (see below), whose sum is σ = 1376880874759. Its totient is φ = 163990125600.

The previous prime is 491978793707. The next prime is 491978793769. The reversal of 491978793744 is 447397879194.

The square root of 491978793744 is 701412.

It is a perfect power (a square), and thus also a powerful number.

491978793744 is a `hidden beast` number, since 4 + 91 + 97 + 87 + 9 + 374 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 8387719 + ... + 8446169.

Almost surely, 2^491978793744 is an apocalyptic number.

491978793744 is the 701412-nd square number.

It is an amenable number.

491978793744 is an abundant number, since it is smaller than the sum of its proper divisors (884902081015).

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

491978793744 is an frugal number, since it uses more digits than its factorization.

491978793744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116916 (or 58456 counting only the distinct ones).

The product of its digits is 384072192, while the sum is 72.

The spelling of 491978793744 in words is "four hundred ninety-one billion, nine hundred seventy-eight million, seven hundred ninety-three thousand, seven hundred forty-four".