128890345 has 8 divisors (see below), whose sum is σ = 163766664. Its totient is φ = 97046784.

The previous prime is 128890339. The next prime is 128890361. The reversal of 128890345 is 543098821.

It can be written as a sum of positive squares in 4 ways, for example, as 22553001 + 106337344 = 4749^2 + 10312^2 .

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 128890345 - 2⁵ = 128890313 is a prime.

It is a super-2 number, since 2×128890345² = 33225442068438050, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 128890298 and 128890307.

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, 758094 + ... + 758263.

It is an arithmetic number, because the mean of its divisors is an integer number (20470833).

Almost surely, 2^128890345 is an apocalyptic number.

It is an amenable number.

128890345 is a deficient number, since it is larger than the sum of its proper divisors (34876319).

128890345 is a wasteful number, since it uses less digits than its factorization.

128890345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1516379.

The product of its (nonzero) digits is 69120, while the sum is 40.

The square root of 128890345 is about 11352.9883731113. The cubic root of 128890345 is about 505.1342256675.

The spelling of 128890345 in words is "one hundred twenty-eight million, eight hundred ninety thousand, three hundred forty-five".