647727854 has 4 divisors (see below), whose sum is σ = 971591784. Its totient is φ = 323863926.

The previous prime is 647727827. The next prime is 647727887. The reversal of 647727854 is 458727746.

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

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 161931962 + ... + 161931965.

It is an arithmetic number, because the mean of its divisors is an integer number (242897946).

Almost surely, 2^647727854 is an apocalyptic number.

647727854 is a deficient number, since it is larger than the sum of its proper divisors (323863930).

647727854 is a wasteful number, since it uses less digits than its factorization.

647727854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323863929.

The product of its digits is 2634240, while the sum is 50.

The square root of 647727854 is about 25450.4981090744. The cubic root of 647727854 is about 865.2285824894.

The spelling of 647727854 in words is "six hundred forty-seven million, seven hundred twenty-seven thousand, eight hundred fifty-four".