128437205 has 8 divisors (see below), whose sum is σ = 165980472. Its totient is φ = 94845888.

The previous prime is 128437181. The next prime is 128437213. The reversal of 128437205 is 502734821.

It can be written as a sum of positive squares in 4 ways, for example, as 3511876 + 124925329 = 1874^2 + 11177^2 .

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 128437205 - 2⁸ = 128436949 is a prime.

It is a super-2 number, since 2×128437205² = 32992231256424050, 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, 987914 + ... + 988043.

It is an arithmetic number, because the mean of its divisors is an integer number (20747559).

Almost surely, 2^128437205 is an apocalyptic number.

It is an amenable number.

128437205 is a deficient number, since it is larger than the sum of its proper divisors (37543267).

128437205 is a wasteful number, since it uses less digits than its factorization.

128437205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1975975.

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 128437205 is about 11333.0139415779. The cubic root of 128437205 is about 504.5415635040.

The spelling of 128437205 in words is "one hundred twenty-eight million, four hundred thirty-seven thousand, two hundred five".