647642312 has 8 divisors (see below), whose sum is σ = 1214329350. Its totient is φ = 323821152.

The previous prime is 647642311. The next prime is 647642321. The reversal of 647642312 is 213246746.

It can be written as a sum of positive squares in only one way, i.e., 346480996 + 301161316 = 18614^2 + 17354^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (647642311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40477637 + ... + 40477652.

Almost surely, 2^647642312 is an apocalyptic number.

It is an amenable number.

647642312 is a deficient number, since it is larger than the sum of its proper divisors (566687038).

647642312 is a wasteful number, since it uses less digits than its factorization.

647642312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80955295 (or 80955291 counting only the distinct ones).

The product of its digits is 48384, while the sum is 35.

The square root of 647642312 is about 25448.8174970862. The cubic root of 647642312 is about 865.1904920880.

It can be divided in two parts, 64764 and 2312, that added together give a palindrome (67076).

The spelling of 647642312 in words is "six hundred forty-seven million, six hundred forty-two thousand, three hundred twelve".