1628902081 has 8 divisors (see below), whose sum is σ = 1642322304. Its totient is φ = 1615516800.

The previous prime is 1628902069. The next prime is 1628902109. The reversal of 1628902081 is 1802098261.

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 1628902081 - 2⁹ = 1628901569 is a prime.

It is a super-2 number, since 2×1628902081² = 5306643978972261122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1628902081.

It is not an unprimeable number, because it can be changed into a prime (1628902181) 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, 89361 + ... + 106033.

It is an arithmetic number, because the mean of its divisors is an integer number (205290288).

Almost surely, 2^1628902081 is an apocalyptic number.

It is an amenable number.

1628902081 is a deficient number, since it is larger than the sum of its proper divisors (13420223).

1628902081 is a wasteful number, since it uses less digits than its factorization.

1628902081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17471.

The product of its (nonzero) digits is 13824, while the sum is 37.

The square root of 1628902081 is about 40359.6590793332. The cubic root of 1628902081 is about 1176.6076273676.

The spelling of 1628902081 in words is "one billion, six hundred twenty-eight million, nine hundred two thousand, eighty-one".