127720865 has 8 divisors (see below), whose sum is σ = 153598848. Its totient is φ = 101954160.

The previous prime is 127720861. The next prime is 127720867. The reversal of 127720865 is 568027721.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 127720865 - 2² = 127720861 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (127720861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25271 + ... + 29900.

It is an arithmetic number, because the mean of its divisors is an integer number (19199856).

Almost surely, 2^127720865 is an apocalyptic number.

It is an amenable number.

127720865 is a deficient number, since it is larger than the sum of its proper divisors (25877983).

127720865 is an equidigital number, since it uses as much as digits as its factorization.

127720865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55639.

The product of its (nonzero) digits is 47040, while the sum is 38.

The square root of 127720865 is about 11301.3656254454. The cubic root of 127720865 is about 503.6018116044.

The spelling of 127720865 in words is "one hundred twenty-seven million, seven hundred twenty thousand, eight hundred sixty-five".