647467847 has 16 divisors (see below), whose sum is σ = 727890912. Its totient is φ = 571950720.

The previous prime is 647467841. The next prime is 647467867. The reversal of 647467847 is 748764746.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 647467847 - 2⁶ = 647467783 is a prime.

It is a super-2 number, since 2×647467847² = 838429225797630818, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647467841) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18308 + ... + 40374.

It is an arithmetic number, because the mean of its divisors is an integer number (45493182).

Almost surely, 2^647467847 is an apocalyptic number.

647467847 is a deficient number, since it is larger than the sum of its proper divisors (80423065).

647467847 is a wasteful number, since it uses less digits than its factorization.

647467847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22178.

The product of its digits is 6322176, while the sum is 53.

The square root of 647467847 is about 25445.3895037981. The cubic root of 647467847 is about 865.1127953859.

The spelling of 647467847 in words is "six hundred forty-seven million, four hundred sixty-seven thousand, eight hundred forty-seven".