491930878 has 8 divisors (see below), whose sum is σ = 761699520. Its totient is φ = 238031040.

The previous prime is 491930861. The next prime is 491930891. The reversal of 491930878 is 878039194.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3967123 + ... + 3967246.

It is an arithmetic number, because the mean of its divisors is an integer number (95212440).

Almost surely, 2^491930878 is an apocalyptic number.

491930878 is a deficient number, since it is larger than the sum of its proper divisors (269768642).

491930878 is a wasteful number, since it uses less digits than its factorization.

491930878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7934402.

The product of its (nonzero) digits is 435456, while the sum is 49.

The square root of 491930878 is about 22179.5148278766. The cubic root of 491930878 is about 789.4077053790.

The spelling of 491930878 in words is "four hundred ninety-one million, nine hundred thirty thousand, eight hundred seventy-eight".