618728544 has 216 divisors, whose sum is σ = 2093062608. Its totient is φ = 176359680.

The previous prime is 618728507. The next prime is 618728557. The reversal of 618728544 is 445827816.

618728544 is a `hidden beast` number, since 6 + 1 + 87 + 28 + 544 = 666.

It is a tau number, because it is divible by the number of its divisors (216).

It is a super-2 number, since 2×618728544² = 765650022320719872, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 618728544.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1469454 + ... + 1469874.

Almost surely, 2^618728544 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 618728544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1046531304).

618728544 is an abundant number, since it is smaller than the sum of its proper divisors (1474334064).

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

618728544 is an frugal number, since it uses more digits than its factorization.

618728544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 462 (or 433 counting only the distinct ones).

The product of its digits is 430080, while the sum is 45.

The square root of 618728544 is about 24874.2546420993. The cubic root of 618728544 is about 852.1186107434.

The spelling of 618728544 in words is "six hundred eighteen million, seven hundred twenty-eight thousand, five hundred forty-four".