647861023 has 4 divisors (see below), whose sum is σ = 649279120. Its totient is φ = 646442928.

The previous prime is 647861021. The next prime is 647861047. The reversal of 647861023 is 320168746.

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

It is a cyclic number.

It is not a de Polignac number, because 647861023 - 2¹ = 647861021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647861021) 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 3 ways as a sum of consecutive naturals, for example, 708363 + ... + 709276.

It is an arithmetic number, because the mean of its divisors is an integer number (162319780).

Almost surely, 2^647861023 is an apocalyptic number.

647861023 is a deficient number, since it is larger than the sum of its proper divisors (1418097).

647861023 is a wasteful number, since it uses less digits than its factorization.

647861023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1418096.

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 647861023 is about 25453.1142102494. The cubic root of 647861023 is about 865.2878737123.

The spelling of 647861023 in words is "six hundred forty-seven million, eight hundred sixty-one thousand, twenty-three".