827178945 has 16 divisors (see below), whose sum is σ = 1401338880. Its totient is φ = 415211264.

The previous prime is 827178943. The next prime is 827178949. The reversal of 827178945 is 549871728.

It is not a de Polignac number, because 827178945 - 2¹ = 827178943 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (827178941) 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 15 ways as a sum of consecutive naturals, for example, 1621665 + ... + 1622174.

It is an arithmetic number, because the mean of its divisors is an integer number (87583680).

Almost surely, 2^827178945 is an apocalyptic number.

827178945 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

It is an amenable number.

827178945 is a deficient number, since it is larger than the sum of its proper divisors (574159935).

827178945 is a wasteful number, since it uses less digits than its factorization.

827178945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3243864.

The product of its digits is 1128960, while the sum is 51.

The square root of 827178945 is about 28760.7187844810. The cubic root of 827178945 is about 938.7137020001.

The spelling of 827178945 in words is "eight hundred twenty-seven million, one hundred seventy-eight thousand, nine hundred forty-five".