916780646 has 4 divisors (see below), whose sum is σ = 1375170972. Its totient is φ = 458390322.

The previous prime is 916780603. The next prime is 916780679. The reversal of 916780646 is 646087619.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 916780646.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 229195160 + ... + 229195163.

It is an arithmetic number, because the mean of its divisors is an integer number (343792743).

Almost surely, 2^916780646 is an apocalyptic number.

916780646 is a deficient number, since it is larger than the sum of its proper divisors (458390326).

916780646 is a wasteful number, since it uses less digits than its factorization.

916780646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 458390325.

The product of its (nonzero) digits is 435456, while the sum is 47.

The square root of 916780646 is about 30278.3857892061. The cubic root of 916780646 is about 971.4530410482.

The spelling of 916780646 in words is "nine hundred sixteen million, seven hundred eighty thousand, six hundred forty-six".