1620200881 has 8 divisors (see below), whose sum is σ = 1791989864. Its totient is φ = 1455148800.

The previous prime is 1620200867. The next prime is 1620200941. The reversal of 1620200881 is 1880020261.

It can be written as a sum of positive squares in 4 ways, for example, as 173159281 + 1447041600 = 13159^2 + 38040^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1620200881 - 2⁹ = 1620200369 is a prime.

It is a super-2 number, since 2×1620200881² = 5250101789586352322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1620200381) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1683720 + ... + 1684681.

It is an arithmetic number, because the mean of its divisors is an integer number (223998733).

Almost surely, 2^1620200881 is an apocalyptic number.

It is an amenable number.

1620200881 is a deficient number, since it is larger than the sum of its proper divisors (171788983).

1620200881 is a wasteful number, since it uses less digits than its factorization.

1620200881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3368451.

The product of its (nonzero) digits is 1536, while the sum is 28.

The square root of 1620200881 is about 40251.7189819267. The cubic root of 1620200881 is about 1174.5088349447.

The spelling of 1620200881 in words is "one billion, six hundred twenty million, two hundred thousand, eight hundred eighty-one".