491280479020 has 24 divisors (see below), whose sum is σ = 1049175262800. Its totient is φ = 193181476032.

The previous prime is 491280479009. The next prime is 491280479033. The reversal of 491280479020 is 20974082194.

It is a super-2 number, since 2×491280479020² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 208168515 + ... + 208170874.

It is an arithmetic number, because the mean of its divisors is an integer number (43715635950).

Almost surely, 2^491280479020 is an apocalyptic number.

It is an amenable number.

491280479020 is an abundant number, since it is smaller than the sum of its proper divisors (557894783780).

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

491280479020 is a wasteful number, since it uses less digits than its factorization.

491280479020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 416339457 (or 416339455 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 46.

The spelling of 491280479020 in words is "four hundred ninety-one billion, two hundred eighty million, four hundred seventy-nine thousand, twenty".