1616608728 has 96 divisors (see below), whose sum is σ = 5221382400. Its totient is φ = 441802944.

The previous prime is 1616608717. The next prime is 1616608733. The reversal of 1616608728 is 8278066161.

It is a happy number.

1616608728 is a `hidden beast` number, since 1 + 6 + 16 + 608 + 7 + 28 = 666.

It is a super-2 number, since 2×1616608728² = 5226847558891555968, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 58138 + ... + 81321.

It is an arithmetic number, because the mean of its divisors is an integer number (54389400).

Almost surely, 2^1616608728 is an apocalyptic number.

1616608728 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1616608728 is an abundant number, since it is smaller than the sum of its proper divisors (3604773672).

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

1616608728 is a wasteful number, since it uses less digits than its factorization.

1616608728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139501 (or 139494 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The square root of 1616608728 is about 40207.0731090936. The cubic root of 1616608728 is about 1173.6401901306.

The spelling of 1616608728 in words is "one billion, six hundred sixteen million, six hundred eight thousand, seven hundred twenty-eight".