1616999328 has 192 divisors, whose sum is σ = 5522307840. Its totient is φ = 450662400.

The previous prime is 1616999309. The next prime is 1616999333. The reversal of 1616999328 is 8239996161.

It is a super-2 number, since 2×1616999328² = 5229373653504903168, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 244708 + ... + 251228.

It is an arithmetic number, because the mean of its divisors is an integer number (28762020).

Almost surely, 2^1616999328 is an apocalyptic number.

1616999328 is a gapful number since it is divisible by the number (18) 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 1616999328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2761153920).

1616999328 is an abundant number, since it is smaller than the sum of its proper divisors (3905308512).

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

1616999328 is a wasteful number, since it uses less digits than its factorization.

1616999328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6588 (or 6574 counting only the distinct ones).

The product of its digits is 1259712, while the sum is 54.

The square root of 1616999328 is about 40211.9301700378. The cubic root of 1616999328 is about 1173.7347062895.

The spelling of 1616999328 in words is "one billion, six hundred sixteen million, nine hundred ninety-nine thousand, three hundred twenty-eight".