647123607 has 64 divisors (see below), whose sum is σ = 1093478400. Its totient is φ = 375217920.

The previous prime is 647123597. The next prime is 647123621. The reversal of 647123607 is 706321746.

647123607 is a `hidden beast` number, since 6 + 47 + 1 + 2 + 3 + 607 = 666.

It is not a de Polignac number, because 647123607 - 2¹⁰ = 647122583 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647123107) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 572619 + ... + 573747.

It is an arithmetic number, because the mean of its divisors is an integer number (17085600).

Almost surely, 2^647123607 is an apocalyptic number.

647123607 is a deficient number, since it is larger than the sum of its proper divisors (446354793).

647123607 is a wasteful number, since it uses less digits than its factorization.

647123607 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1245 (or 1239 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 36.

The square root of 647123607 is about 25438.6243142195. The cubic root of 647123607 is about 864.9594496901.

The spelling of 647123607 in words is "six hundred forty-seven million, one hundred twenty-three thousand, six hundred seven".