128490845 has 24 divisors (see below), whose sum is σ = 187206144. Its totient is φ = 82918656.

The previous prime is 128490839. The next prime is 128490881. The reversal of 128490845 is 548094821.

It is not a de Polignac number, because 128490845 - 2⁴ = 128490829 is a prime.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3764 + ... + 16466.

It is an arithmetic number, because the mean of its divisors is an integer number (7800256).

Almost surely, 2^128490845 is an apocalyptic number.

It is an amenable number.

128490845 is a deficient number, since it is larger than the sum of its proper divisors (58715299).

128490845 is a wasteful number, since it uses less digits than its factorization.

128490845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12749 (or 12732 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 41.

The square root of 128490845 is about 11335.3802318228. The cubic root of 128490845 is about 504.6117919677.

It can be divided in two parts, 1284 and 90845, that added together give a palindrome (92129).

The spelling of 128490845 in words is "one hundred twenty-eight million, four hundred ninety thousand, eight hundred forty-five".