618781680 has 200 divisors, whose sum is σ = 2344765104. Its totient is φ = 149990400.

The previous prime is 618781679. The next prime is 618781687. The reversal of 618781680 is 86187816.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (618781687) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 66940 + ... + 75620.

Almost surely, 2^618781680 is an apocalyptic number.

618781680 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 618781680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1172382552).

618781680 is an abundant number, since it is smaller than the sum of its proper divisors (1725983424).

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

618781680 is a wasteful number, since it uses less digits than its factorization.

618781680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8717 (or 8702 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 45.

The square root of 618781680 is about 24875.3227114745. The cubic root of 618781680 is about 852.1430031736.

The spelling of 618781680 in words is "six hundred eighteen million, seven hundred eighty-one thousand, six hundred eighty".