827145785 has 4 divisors (see below), whose sum is σ = 992574948. Its totient is φ = 661716624.

The previous prime is 827145773. The next prime is 827145799. The reversal of 827145785 is 587541728.

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 508773136 + 318372649 = 22556^2 + 17843^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-827145785 is a prime.

It is a Duffinian 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, 82714574 + ... + 82714583.

It is an arithmetic number, because the mean of its divisors is an integer number (248143737).

Almost surely, 2^827145785 is an apocalyptic number.

It is an amenable number.

827145785 is a deficient number, since it is larger than the sum of its proper divisors (165429163).

827145785 is a wasteful number, since it uses less digits than its factorization.

827145785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165429162.

The product of its digits is 627200, while the sum is 47.

The square root of 827145785 is about 28760.1422979790. The cubic root of 827145785 is about 938.7011580951.

The spelling of 827145785 in words is "eight hundred twenty-seven million, one hundred forty-five thousand, seven hundred eighty-five".