491873228 has 72 divisors (see below), whose sum is σ = 1107994272. Its totient is φ = 186912000.

The previous prime is 491873219. The next prime is 491873237. The reversal of 491873228 is 822378194.

It is an interprime number because it is at equal distance from previous prime (491873219) and next prime (491873237).

It is a Harshad number since it is a multiple of its sum of digits (44).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 137138 + ... + 140678.

Almost surely, 2^491873228 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 491873228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (553997136).

491873228 is an abundant number, since it is smaller than the sum of its proper divisors (616121044).

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

491873228 is a wasteful number, since it uses less digits than its factorization.

491873228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3615 (or 3602 counting only the distinct ones).

The product of its digits is 193536, while the sum is 44.

The square root of 491873228 is about 22178.2151671409. The cubic root of 491873228 is about 789.3768669462.

The spelling of 491873228 in words is "four hundred ninety-one million, eight hundred seventy-three thousand, two hundred twenty-eight".