673778827 has 4 divisors (see below), whose sum is σ = 673843720. Its totient is φ = 673713936.

The previous prime is 673778821. The next prime is 673778839. The reversal of 673778827 is 728877376.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a 4-Lehmer number, since φ(673778827) divides (673778827-1)⁴.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-673778827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (673778821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12978 + ... + 38935.

It is an arithmetic number, because the mean of its divisors is an integer number (168460930).

It is a Poulet number, since it divides 2^673778826-1.

Almost surely, 2^673778827 is an apocalyptic number.

673778827 is the 12979-th decagonal number.

673778827 is a deficient number, since it is larger than the sum of its proper divisors (64893).

673778827 is a wasteful number, since it uses less digits than its factorization.

673778827 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64892.

The product of its digits is 5531904, while the sum is 55.

The square root of 673778827 is about 25957.2499891649. The cubic root of 673778827 is about 876.6760048706.

The spelling of 673778827 in words is "six hundred seventy-three million, seven hundred seventy-eight thousand, eight hundred twenty-seven".