618869856 has 48 divisors (see below), whose sum is σ = 1772221248. Its totient is φ = 187536000.

The previous prime is 618869851. The next prime is 618869869. The reversal of 618869856 is 658968816.

It is a tau number, because it is divible by the number of its divisors (48).

It is a junction number, because it is equal to n+sod(n) for n = 618869796 and 618869805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (618869851) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 291970 + ... + 294081.

It is an arithmetic number, because the mean of its divisors is an integer number (36921276).

Almost surely, 2^618869856 is an apocalyptic number.

618869856 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

618869856 is an abundant number, since it is smaller than the sum of its proper divisors (1153351392).

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

618869856 is a wasteful number, since it uses less digits than its factorization.

618869856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 586075 (or 586067 counting only the distinct ones).

The product of its digits is 4976640, while the sum is 57.

The square root of 618869856 is about 24877.0950072552. The cubic root of 618869856 is about 852.1834778650.

The spelling of 618869856 in words is "six hundred eighteen million, eight hundred sixty-nine thousand, eight hundred fifty-six".