427782809 has 8 divisors (see below), whose sum is σ = 430856712. Its totient is φ = 424716160.

The previous prime is 427782787. The next prime is 427782811. The reversal of 427782809 is 908287724.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 327184 + 427455625 = 572^2 + 20675^2 .

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 427782809 - 2¹² = 427778713 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 (427782869) 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, 174029 + ... + 176469.

It is an arithmetic number, because the mean of its divisors is an integer number (53857089).

Almost surely, 2^427782809 is an apocalyptic number.

It is an amenable number.

427782809 is a deficient number, since it is larger than the sum of its proper divisors (3073903).

427782809 is a wasteful number, since it uses less digits than its factorization.

427782809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3627.

The product of its (nonzero) digits is 451584, while the sum is 47.

The square root of 427782809 is about 20682.9110378593. The cubic root of 427782809 is about 753.4847078576.

The spelling of 427782809 in words is "four hundred twenty-seven million, seven hundred eighty-two thousand, eight hundred nine".