427820765 has 4 divisors (see below), whose sum is σ = 513384924. Its totient is φ = 342256608.

The previous prime is 427820753. The next prime is 427820779. The reversal of 427820765 is 567028724.

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

It can be written as a sum of positive squares in 2 ways, for example, as 144336196 + 283484569 = 12014^2 + 16837^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-427820765 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42782072 + ... + 42782081.

It is an arithmetic number, because the mean of its divisors is an integer number (128346231).

Almost surely, 2^427820765 is an apocalyptic number.

It is an amenable number.

427820765 is a deficient number, since it is larger than the sum of its proper divisors (85564159).

427820765 is an equidigital number, since it uses as much as digits as its factorization.

427820765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85564158.

The product of its (nonzero) digits is 188160, while the sum is 41.

The square root of 427820765 is about 20683.8285866036. The cubic root of 427820765 is about 753.5069920784.

The spelling of 427820765 in words is "four hundred twenty-seven million, eight hundred twenty thousand, seven hundred sixty-five".