1620128226 has 16 divisors (see below), whose sum is σ = 3261716928. Its totient is φ = 536466000.

The previous prime is 1620128207. The next prime is 1620128249. The reversal of 1620128226 is 6228210261.

It is a junction number, because it is equal to n+sod(n) for n = 1620128193 and 1620128202.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 893205 + ... + 895016.

It is an arithmetic number, because the mean of its divisors is an integer number (203857308).

Almost surely, 2^1620128226 is an apocalyptic number.

1620128226 is an abundant number, since it is smaller than the sum of its proper divisors (1641588702).

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

1620128226 is a wasteful number, since it uses less digits than its factorization.

1620128226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1788377.

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 1620128226 is about 40250.8164637688. The cubic root of 1620128226 is about 1174.4912784355.

Adding to 1620128226 its reverse (6228210261), we get a palindrome (7848338487).

The spelling of 1620128226 in words is "one billion, six hundred twenty million, one hundred twenty-eight thousand, two hundred twenty-six".