491978330 has 32 divisors (see below), whose sum is σ = 933411600. Its totient is φ = 186414592.

The previous prime is 491978327. The next prime is 491978369. The reversal of 491978330 is 33879194.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 97042201 + 394936129 = 9851^2 + 19873^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 635 + ... + 31374.

Almost surely, 2^491978330 is an apocalyptic number.

491978330 is a deficient number, since it is larger than the sum of its proper divisors (441433270).

491978330 is a wasteful number, since it uses less digits than its factorization.

491978330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32098.

The product of its (nonzero) digits is 163296, while the sum is 44.

The square root of 491978330 is about 22180.5845279154. The cubic root of 491978330 is about 789.4330868379.

The spelling of 491978330 in words is "four hundred ninety-one million, nine hundred seventy-eight thousand, three hundred thirty".