618985680 has 160 divisors (see below), whose sum is σ = 1994539008. Its totient is φ = 158630400.

The previous prime is 618985663. The next prime is 618985687. The reversal of 618985680 is 86589816.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (618985687) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2016087 + ... + 2016393.

Almost surely, 2^618985680 is an apocalyptic number.

618985680 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 618985680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (997269504).

618985680 is an abundant number, since it is smaller than the sum of its proper divisors (1375553328).

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

618985680 is a wasteful number, since it uses less digits than its factorization.

618985680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 625 (or 619 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 51.

The square root of 618985680 is about 24879.4228228872. The cubic root of 618985680 is about 852.2366377452.

The spelling of 618985680 in words is "six hundred eighteen million, nine hundred eighty-five thousand, six hundred eighty".