618686816 has 48 divisors (see below), whose sum is σ = 1398720960. Its totient is φ = 266417280.

The previous prime is 618686813. The next prime is 618686839.

It is a happy number.

618686816 is nontrivially palindromic in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (618686813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39566 + ... + 52941.

It is an arithmetic number, because the mean of its divisors is an integer number (29140020).

Almost surely, 2^618686816 is an apocalyptic number.

It is an amenable number.

618686816 is an abundant number, since it is smaller than the sum of its proper divisors (780034144).

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

618686816 is a wasteful number, since it uses less digits than its factorization.

618686816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92547 (or 92539 counting only the distinct ones).

The product of its digits is 663552, while the sum is 50.

The square root of 618686816 is about 24873.4158490546. The cubic root of 618686816 is about 852.0994542516.

The spelling of 618686816 in words is "six hundred eighteen million, six hundred eighty-six thousand, eight hundred sixteen".