618243840 has 360 divisors, whose sum is σ = 2270434320. Its totient is φ = 160579584.

The previous prime is 618243833. The next prime is 618243851. The reversal of 618243840 is 48342816.

618243840 is a `hidden beast` number, since 6 + 182 + 438 + 40 = 666.

It is a tau number, because it is divible by the number of its divisors (360).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 618243795 and 618243804.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 6946516 + ... + 6946604.

It is an arithmetic number, because the mean of its divisors is an integer number (6306762).

Almost surely, 2^618243840 is an apocalyptic number.

618243840 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 618243840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1135217160).

618243840 is an abundant number, since it is smaller than the sum of its proper divisors (1652190480).

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

618243840 is an equidigital number, since it uses as much as digits as its factorization.

618243840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189 (or 166 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 36.

The square root of 618243840 is about 24864.5096472864. The cubic root of 618243840 is about 851.8960396859.

The spelling of 618243840 in words is "six hundred eighteen million, two hundred forty-three thousand, eight hundred forty".