1613128500 has 288 divisors, whose sum is σ = 5525170560. Its totient is φ = 406296000.

The previous prime is 1613128409. The next prime is 1613128507. The reversal of 1613128500 is 58213161.

1613128500 is a `hidden beast` number, since 1 + 6 + 131 + 28 + 500 = 666.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1613128507) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 4873335 + ... + 4873665.

It is an arithmetic number, because the mean of its divisors is an integer number (19184620).

Almost surely, 2^1613128500 is an apocalyptic number.

1613128500 is a gapful number since it is divisible by the number (10) 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 1613128500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2762585280).

1613128500 is an abundant number, since it is smaller than the sum of its proper divisors (3912042060).

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

1613128500 is a wasteful number, since it uses less digits than its factorization.

1613128500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397 (or 360 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 1613128500 is about 40163.7709882924. The cubic root of 1613128500 is about 1172.7973826023.

The spelling of 1613128500 in words is "one billion, six hundred thirteen million, one hundred twenty-eight thousand, five hundred".