491777280 has 108 divisors (see below), whose sum is σ = 1701538020. Its totient is φ = 131137536.

The previous prime is 491777269. The next prime is 491777281. The reversal of 491777280 is 82777194.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 178062336 + 313714944 = 13344^2 + 17712^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491777281) 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, 9825 + ... + 32864.

Almost surely, 2^491777280 is an apocalyptic number.

491777280 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

491777280 is an abundant number, since it is smaller than the sum of its proper divisors (1209760740).

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

491777280 is a wasteful number, since it uses less digits than its factorization.

491777280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42716 (or 42699 counting only the distinct ones).

The product of its (nonzero) digits is 197568, while the sum is 45.

The square root of 491777280 is about 22176.0519479911. The cubic root of 491777280 is about 789.3255366083.

The spelling of 491777280 in words is "four hundred ninety-one million, seven hundred seventy-seven thousand, two hundred eighty".