1620874000 has 40 divisors (see below), whose sum is σ = 3919278168. Its totient is φ = 648348800.

The previous prime is 1620873973. The next prime is 1620874081. The reversal of 1620874000 is 4780261.

It can be written as a sum of positive squares in 4 ways, for example, as 125350416 + 1495523584 = 11196^2 + 38672^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 1620874000.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 403219 + ... + 407218.

Almost surely, 2^1620874000 is an apocalyptic number.

1620874000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1620874000 is an abundant number, since it is smaller than the sum of its proper divisors (2298404168).

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

1620874000 is an equidigital number, since it uses as much as digits as its factorization.

1620874000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 810460 (or 810444 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 1620874000 is about 40260.0794832797. The cubic root of 1620874000 is about 1174.6714639049.

The spelling of 1620874000 in words is "one billion, six hundred twenty million, eight hundred seventy-four thousand".