427738561 has 8 divisors (see below), whose sum is σ = 432921384. Its totient is φ = 422580480.

The previous prime is 427738559. The next prime is 427738573. The reversal of 427738561 is 165837724.

It can be written as a sum of positive squares in 4 ways, for example, as 45144961 + 382593600 = 6719^2 + 19560^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 427738561 - 2¹ = 427738559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (427732561) 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, 29851 + ... + 41791.

It is an arithmetic number, because the mean of its divisors is an integer number (54115173).

Almost surely, 2^427738561 is an apocalyptic number.

427738561 is the 11941-st octagonal number.

It is an amenable number.

427738561 is a deficient number, since it is larger than the sum of its proper divisors (5182823).

427738561 is a wasteful number, since it uses less digits than its factorization.

427738561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12371.

The product of its digits is 282240, while the sum is 43.

The square root of 427738561 is about 20681.8413348522. The cubic root of 427738561 is about 753.4587278974.

The spelling of 427738561 in words is "four hundred twenty-seven million, seven hundred thirty-eight thousand, five hundred sixty-one".