127828969 has 4 divisors (see below), whose sum is σ = 131283844. Its totient is φ = 124374096.

The previous prime is 127828957. The next prime is 127828991. The reversal of 127828969 is 969828721.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 84860944 + 42968025 = 9212^2 + 6555^2 .

It is a cyclic number.

It is not a de Polignac number, because 127828969 - 2⁵ = 127828937 is a prime.

It is a super-2 number, since 2×127828969² = 32680490631205922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (127828919) 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, 1727382 + ... + 1727455.

It is an arithmetic number, because the mean of its divisors is an integer number (32820961).

Almost surely, 2^127828969 is an apocalyptic number.

It is an amenable number.

127828969 is a deficient number, since it is larger than the sum of its proper divisors (3454875).

127828969 is an equidigital number, since it uses as much as digits as its factorization.

127828969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3454874.

The product of its digits is 870912, while the sum is 52.

The square root of 127828969 is about 11306.1473986500. The cubic root of 127828969 is about 503.7438557869.

The spelling of 127828969 in words is "one hundred twenty-seven million, eight hundred twenty-eight thousand, nine hundred sixty-nine".