618251620 has 72 divisors (see below), whose sum is σ = 1514109240. Its totient is φ = 211438080.

The previous prime is 618251581. The next prime is 618251701. The reversal of 618251620 is 26152816.

It can be written as a sum of positive squares in 4 ways, for example, as 33124 + 618218496 = 182^2 + 24864^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 745366 + ... + 746194.

It is an arithmetic number, because the mean of its divisors is an integer number (21029295).

Almost surely, 2^618251620 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 618251620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (757054620).

618251620 is an abundant number, since it is smaller than the sum of its proper divisors (895857620).

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

618251620 is a wasteful number, since it uses less digits than its factorization.

618251620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1613 (or 1604 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 618251620 is about 24864.6660946814. Note that the first 3 decimals coincide. The cubic root of 618251620 is about 851.8996130998.

The spelling of 618251620 in words is "six hundred eighteen million, two hundred fifty-one thousand, six hundred twenty".