427661427 has 4 divisors (see below), whose sum is σ = 570215240. Its totient is φ = 285107616.

The previous prime is 427661419. The next prime is 427661513. The reversal of 427661427 is 724166724.

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

It is not a de Polignac number, because 427661427 - 2³ = 427661419 is a prime.

It is a super-2 number, since 2×427661427² = 365788592287352658, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (427661327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71276902 + ... + 71276907.

It is an arithmetic number, because the mean of its divisors is an integer number (142553810).

Almost surely, 2^427661427 is an apocalyptic number.

427661427 is a deficient number, since it is larger than the sum of its proper divisors (142553813).

427661427 is a wasteful number, since it uses less digits than its factorization.

427661427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142553812.

The product of its digits is 112896, while the sum is 39.

The square root of 427661427 is about 20679.9764748416. The cubic root of 427661427 is about 753.4134348262.

It can be divided in two parts, 4276 and 61427, that added together give a triangular number (65703 = T₃₆₂).

The spelling of 427661427 in words is "four hundred twenty-seven million, six hundred sixty-one thousand, four hundred twenty-seven".