647773923 has 8 divisors (see below), whose sum is σ = 891559936. Its totient is φ = 417918600.

The previous prime is 647773891. The next prime is 647773927. The reversal of 647773923 is 329377746.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 647773923 - 2⁵ = 647773891 is a prime.

It is a super-2 number, since 2×647773923² = 839222110637619858, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (647773927) 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 7 ways as a sum of consecutive naturals, for example, 3482563 + ... + 3482748.

It is an arithmetic number, because the mean of its divisors is an integer number (111444992).

Almost surely, 2^647773923 is an apocalyptic number.

647773923 is a deficient number, since it is larger than the sum of its proper divisors (243786013).

647773923 is a wasteful number, since it uses less digits than its factorization.

647773923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6965345.

The product of its digits is 1333584, while the sum is 48.

The square root of 647773923 is about 25451.4031636765. The cubic root of 647773923 is about 865.2490948442.

The spelling of 647773923 in words is "six hundred forty-seven million, seven hundred seventy-three thousand, nine hundred twenty-three".