618909816 has 64 divisors (see below), whose sum is σ = 1772916480. Its totient is φ = 176371200.

The previous prime is 618909791. The next prime is 618909817.

618909816 is nontrivially palindromic in base 10.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (618909817) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62775 + ... + 71961.

It is an arithmetic number, because the mean of its divisors is an integer number (27701820).

Almost surely, 2^618909816 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 618909816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (886458240).

618909816 is an abundant number, since it is smaller than the sum of its proper divisors (1154006664).

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

618909816 is a wasteful number, since it uses less digits than its factorization.

618909816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9604 (or 9600 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 48.

The square root of 618909816 is about 24877.8981427290. The cubic root of 618909816 is about 852.2018191035.

The spelling of 618909816 in words is "six hundred eighteen million, nine hundred nine thousand, eight hundred sixteen".