1628239889 has 8 divisors (see below), whose sum is σ = 1724392800. Its totient is φ = 1532128576.

The previous prime is 1628239861. The next prime is 1628239909. The reversal of 1628239889 is 9889328261.

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 1628239889 - 2²⁴ = 1611462673 is a prime.

It is a super-2 number, since 2×1628239889² = 5302330272261464642, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1628239819) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 110342 + ... + 124224.

It is an arithmetic number, because the mean of its divisors is an integer number (215549100).

Almost surely, 2^1628239889 is an apocalyptic number.

It is an amenable number.

1628239889 is a deficient number, since it is larger than the sum of its proper divisors (96152911).

1628239889 is a wasteful number, since it uses less digits than its factorization.

1628239889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20799.

The product of its digits is 2985984, while the sum is 56.

The square root of 1628239889 is about 40351.4546082294. The cubic root of 1628239889 is about 1176.4481649970.

The spelling of 1628239889 in words is "one billion, six hundred twenty-eight million, two hundred thirty-nine thousand, eight hundred eighty-nine".