127890663 has 4 divisors (see below), whose sum is σ = 170520888. Its totient is φ = 85260440.

The previous prime is 127890661. The next prime is 127890683. The reversal of 127890663 is 366098721.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 366098721 = 3 ⋅122032907.

It is a cyclic number.

It is not a de Polignac number, because 127890663 - 2¹ = 127890661 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (127890661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21315108 + ... + 21315113.

It is an arithmetic number, because the mean of its divisors is an integer number (42630222).

Almost surely, 2^127890663 is an apocalyptic number.

127890663 is a deficient number, since it is larger than the sum of its proper divisors (42630225).

127890663 is an equidigital number, since it uses as much as digits as its factorization.

127890663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42630224.

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 127890663 is about 11308.8754082800. The cubic root of 127890663 is about 503.8248832601.

The spelling of 127890663 in words is "one hundred twenty-seven million, eight hundred ninety thousand, six hundred sixty-three".