647802047 has 4 divisors (see below), whose sum is σ = 648906216. Its totient is φ = 646697880.

The previous prime is 647802041. The next prime is 647802049. The reversal of 647802047 is 740208746.

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 647802047 - 2²⁴ = 631024831 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 647802047.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647802041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 551204 + ... + 552377.

It is an arithmetic number, because the mean of its divisors is an integer number (162226554).

Almost surely, 2^647802047 is an apocalyptic number.

647802047 is a deficient number, since it is larger than the sum of its proper divisors (1104169).

647802047 is a wasteful number, since it uses less digits than its factorization.

647802047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1104168.

The product of its (nonzero) digits is 75264, while the sum is 38.

The square root of 647802047 is about 25451.9556615990. The cubic root of 647802047 is about 865.2616166580.

The spelling of 647802047 in words is "six hundred forty-seven million, eight hundred two thousand, forty-seven".