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128077 = 211607

128077 has 4 divisors (see below), whose sum is σ = 128896. Its totient is φ = 127260.

The previous prime is 128053. The next prime is 128099. The reversal of 128077 is 770821.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-128077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 128077.

It is not an unprimeable number, because it can be changed into a prime (128047) 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, 93 + ... + 514.

It is an arithmetic number, because the mean of its divisors is an integer number (32224).

2128077 is an apocalyptic number.

It is an amenable number.

128077 is a deficient number, since it is larger than the sum of its proper divisors (819).

128077 is an equidigital number, since it uses as much as digits as its factorization.

128077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 818.

The product of its (nonzero) digits is 784, while the sum is 25.

The square root of 128077 is about 357.8784709926. The cubic root of 128077 is about 50.4069455868.

Adding to 128077 its reverse (770821), we get a palindrome (898898).

The spelling of 128077 in words is "one hundred twenty-eight thousand, seventy-seven".

Divisors: 1 211 607 128077