491697078 has 8 divisors (see below), whose sum is σ = 983394168. Its totient is φ = 163899024.

The previous prime is 491697077. The next prime is 491697097. The reversal of 491697078 is 870796194.

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

491697078 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 491697078.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491697077) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40974751 + ... + 40974762.

It is an arithmetic number, because the mean of its divisors is an integer number (122924271).

Almost surely, 2^491697078 is an apocalyptic number.

491697078 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

491697078 is a wasteful number, since it uses less digits than its factorization.

491697078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81949518.

The product of its (nonzero) digits is 762048, while the sum is 51.

The square root of 491697078 is about 22174.2435722168. The cubic root of 491697078 is about 789.2826249550.

The spelling of 491697078 in words is "four hundred ninety-one million, six hundred ninety-seven thousand, seventy-eight".