127281690 has 24 divisors (see below), whose sum is σ = 330932628. Its totient is φ = 33941760.

The previous prime is 127281689. The next prime is 127281757. The reversal of 127281690 is 96182721.

It can be written as a sum of positive squares in 2 ways, for example, as 125686521 + 1595169 = 11211^2 + 1263^2 .

It is a super-2 number, since 2×127281690² = 32401257218512200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 707031 + ... + 707210.

Almost surely, 2^127281690 is an apocalyptic number.

127281690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

127281690 is an abundant number, since it is smaller than the sum of its proper divisors (203650938).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

127281690 is a wasteful number, since it uses less digits than its factorization.

127281690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1414254 (or 1414251 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 127281690 is about 11281.9187197923. The cubic root of 127281690 is about 503.0239281817.

The spelling of 127281690 in words is "one hundred twenty-seven million, two hundred eighty-one thousand, six hundred ninety".