128106445 has 8 divisors (see below), whose sum is σ = 155313144. Its totient is φ = 101428224.

The previous prime is 128106439. The next prime is 128106457. The reversal of 128106445 is 544601821.

It can be written as a sum of positive squares in 4 ways, for example, as 7502121 + 120604324 = 2739^2 + 10982^2 .

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 128106445 - 2⁵ = 128106413 is a prime.

It is a super-2 number, since 2×128106445² = 32822522501076050, which contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 131584 + ... + 132553.

It is an arithmetic number, because the mean of its divisors is an integer number (19414143).

Almost surely, 2^128106445 is an apocalyptic number.

It is an amenable number.

128106445 is a deficient number, since it is larger than the sum of its proper divisors (27206699).

128106445 is an equidigital number, since it uses as much as digits as its factorization.

128106445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264239.

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 128106445 is about 11318.4117702088. The cubic root of 128106445 is about 504.1080815593.

The spelling of 128106445 in words is "one hundred twenty-eight million, one hundred six thousand, four hundred forty-five".