128893277 has 4 divisors (see below), whose sum is σ = 128922780. Its totient is φ = 128863776.

The previous prime is 128893267. The next prime is 128893301. The reversal of 128893277 is 772398821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 772398821 = 31 ⋅24916091.

It can be written as a sum of positive squares in 2 ways, for example, as 127486681 + 1406596 = 11291^2 + 1186^2 .

It is a cyclic number.

It is not a de Polignac number, because 128893277 - 2⁶ = 128893213 is a prime.

It is a super-2 number, since 2×128893277² = 33226953711597458, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128893267) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6752 + ... + 17417.

It is an arithmetic number, because the mean of its divisors is an integer number (32230695).

Almost surely, 2^128893277 is an apocalyptic number.

It is an amenable number.

128893277 is a deficient number, since it is larger than the sum of its proper divisors (29503).

128893277 is an equidigital number, since it uses as much as digits as its factorization.

128893277 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29502.

The product of its digits is 338688, while the sum is 47.

The square root of 128893277 is about 11353.1175013738. The cubic root of 128893277 is about 505.1380559061.

The spelling of 128893277 in words is "one hundred twenty-eight million, eight hundred ninety-three thousand, two hundred seventy-seven".