491172880 has 60 divisors (see below), whose sum is σ = 1255255596. Its totient is φ = 178604800.

The previous prime is 491172863. The next prime is 491172883. The reversal of 491172880 is 88271194.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 129868816 + 361304064 = 11396^2 + 19008^2 .

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (491172883) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15691 + ... + 35050.

Almost surely, 2^491172880 is an apocalyptic number.

491172880 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

491172880 is an abundant number, since it is smaller than the sum of its proper divisors (764082716).

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

491172880 is a wasteful number, since it uses less digits than its factorization.

491172880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50776 (or 50759 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 40.

The square root of 491172880 is about 22162.4204454297. The cubic root of 491172880 is about 789.0020406220.

It can be divided in two parts, 491 and 172880, that added together give a palindrome (173371).

The spelling of 491172880 in words is "four hundred ninety-one million, one hundred seventy-two thousand, eight hundred eighty".