1620281016 has 128 divisors (see below), whose sum is σ = 4815720000. Its totient is φ = 502972416.

The previous prime is 1620280997. The next prime is 1620281029. The reversal of 1620281016 is 6101820261.

1620281016 is a `hidden beast` number, since 1 + 620 + 28 + 1 + 0 + 16 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 353910 + ... + 358458.

Almost surely, 2^1620281016 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 1620281016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2407860000).

1620281016 is an abundant number, since it is smaller than the sum of its proper divisors (3195438984).

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

1620281016 is a wasteful number, since it uses less digits than its factorization.

1620281016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4678 (or 4668 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 1620281016 is about 40252.7143929450. The cubic root of 1620281016 is about 1174.5281983284.

The spelling of 1620281016 in words is "one billion, six hundred twenty million, two hundred eighty-one thousand, sixteen".