1628200081 has 4 divisors (see below), whose sum is σ = 1630169712. Its totient is φ = 1626230452.

The previous prime is 1628200069. The next prime is 1628200129. The reversal of 1628200081 is 1800028261.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1800028261 = 239 ⋅7531499.

It is a cyclic number.

It is not a de Polignac number, because 1628200081 - 2⁷ = 1628199953 is a prime.

It is a super-2 number, since 2×1628200081² = 5302071007536813122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1628200051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 983575 + ... + 985228.

It is an arithmetic number, because the mean of its divisors is an integer number (407542428).

Almost surely, 2^1628200081 is an apocalyptic number.

It is an amenable number.

1628200081 is a deficient number, since it is larger than the sum of its proper divisors (1969631).

1628200081 is an equidigital number, since it uses as much as digits as its factorization.

1628200081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1969630.

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

The square root of 1628200081 is about 40350.9613392296. The cubic root of 1628200081 is about 1176.4385774601.

The spelling of 1628200081 in words is "one billion, six hundred twenty-eight million, two hundred thousand, eighty-one".